A pentagon is the name for a five-sided polygon. Is there a way to also mark the area in (1,3), at the same time. The featureGroup can contain 0 or more features with geometry types Point, LineString, and Polygon. You can vote up the examples you like or vote down the ones you don't like. Refer below images. Hi, Can anyone point me to some documentation or sample code/applications that demonstrate how to draw polygons on a map using a mouse and saving the shape coordinates. In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. In some drawings, polygons act as zero-thickness solid surfaces with both sides visible rather than as the faces of solid objects, where back faces can be culled. Description. geometric library, setting draw=none. Use the arguments of addPolygons() to map the high income zip codes in NC with:. contour function do it. How to Find the Area of a Regular Polygon; Area of a Regular Polygon Examples; Area of a Regular Polygon. Visio Plan 2 Visio Professional 2019 Visio Standard 2019 Visio Professional 2016 Visio Standard 2016 Visio Premium 2010 Visio 2010 Visio Standard 2010 More Less. 6 and onwards it is possible to draw polygons with holes by providing a subgroup aesthetic that differentiates the outer ring points from those describing. Any point in a circle can be identified as (r cos e,r sin e) where r is the radius and e is the angle. The information in a frequency distribution table can be used to draw these graphs. (1 reply) Hello: I've come to a dead-end in my search for a solution to a graphing problem that I am encountering. pi * r n = 50 length = circumference / n polygon(t, n, length) The first line computes the circumference of a circle with radius r using the formula 2 π r. A boundary thickness of 1 pixel, Polygons that are colored with the nc_pal palette and are highlighted on hover, and. Each database is composed of a collection of polygons, and each polygon has a unique name. I am missing Draw Polygon tool and others from my list of markup tools. Then, click the Star Ratio handle in the upper right corner of the polygon, and drag in towards the radius. What parameters does it need? Four come to mind: the number of sides, the center x and y coordinate, and the radius. uk), James Cheshire, Rachel Oldroyd and others geographicattributedata)and. The simplest way is to draw a polygon shape and convert it; however, you could use any polygon shapefile for this. I am trying to draw just the nodes (no sides) at the vertices of a regular hexagon. Small program size and fast download. Shading lines are handled internally by R according to the fillOddEven argument, but device-based solid fills depend on the graphics device. The length of its sides can be calculated using trigonometry. vectors containing the coordinates of the vertices of the polygon. Right click on map to begin. Ultimate, R-Type doesn’t have as deep a legacy to draw from for fan-service stuff. Creating Drawing Quiz Jaiprakash Pandey 2020-03-05T01 Can you use Polygon tool to make a polygon with a known edge length without using inscribed or circumscribed. To draw these nonconvex polygons, you typically subdivide them into convex polygons - usually triangles, as shown in Figure 2-12 - and then draw the triangles. Please see code. As a R learner programmer, it took me unconscionably long to work out how to use polygon to shade under and between curves, despite searches of the R manual and R-help – they just didn’t start far enough back. Starting with the polygon on the left, the center polygon is rotated clockwise 90°, the right one is flipped vertically. The most familiar polygons are the triangle, the rectangle, and the square. How to Visualize and Compare Distributions in R By Nathan Yau Single data points from a large dataset can make it more relatable, but those individual numbers don’t mean much without something to compare to. All the angles are congruent in an equiangular polygon. This is the key point in our algorithm to draw regular HTML5 Canvas Polygon. This is how they are alike, but what makes them different?. You may need to move it out of the way before moving on to the next step. They are made of straight lines, and the shape is "closed" (all the lines connect up). MOTIVATION FOR RUNNING THE WORKSHOP The aim of this workshop is to assist the educators who do not have the Autograph software to use the readily available software (Microsoft excel) to draw the statistical curves and graphs. Thank you @ladyanimeyuki @fizziispam and @mmmilkbee for sending me your trollsona/fantroll. The dataset is over there, as a tab-delimited text file. If that is correct, take a look at. In the flutter, only the common polygon was provided to direct to use. Description. On a mission to transform learning through computational thinking, Shodor is dedicated to the reform and improvement of mathematics and science education through student enrichment, faculty enhancement, and interactive curriculum development at all levels. BrainPOP; BrainPOP Jr. If you have ever wondered about how to construct regular polygons from a circle, you're reading. Draw the circle over the area you wish to clip. Is there a way to also mark the area in (1,3), at the same time. Description. 80 LESSON3 Completing Partial Drawings of Polygons 7 Date Time. The figure is not a polygon because it has a side that is not a segment. a point is within a polygon if and only if its y-value is within the range of the projected polygon on the y-axis and the x-value of the point is below odd number of polygon edges. Strengths / weaknesses: QGIS is simple, free, open-source software Open the georeferenced image (Layer > Add Raster Layer) or WMS layer (Layer > Add WMS Layer) in QGIS. r is the radius (circumradius) n is the number of sides cos is the cosine function calculated in degrees (see Trigonometry Overview) Irregular Polygons Irregular polygons are not thought of as having an incircle or even a center. Output options: A shapefile or KML file with vector features. polygon_perimeter (r, c, shape=None, clip=False) [source] ¶ Generate polygon perimeter coordinates. Use whatever is shorter in your language. All locations with the same id belong to the same polygon. Enter value and click on calculate. This message: [ Message body] [ More options] Related messages: [ Next message] [ Previous message] [ In reply to] [ Re: [R] Lattice wireframe: How to avoid drawing lines around polygons when using shade=TRUE] [ Next in thread] [ Replies]. (For example, color all triangles one color. shape tuple, optional. The section “Close the polygon” simply replicates one of these indices so that the resulting polygon will contain one repeated point, closing on itself. This answer should be easily modified to accomplish what I want, but I am such a novice that I have difficulty. This is unwieldy and expensive. They will identify polygons as either their name or category (hex, tri, quad, etc) and then color according to the key. The angles have been calculated manually. You can tell, just by looking at the picture, that $$ \angle A and \angle B $$ are not congruent. However, in more advance applications it is useful to be able to draw more complex polygons. EXTRA PRACTICE. Since you probably want to draw many polygons during a program, it makes sense to have a polygon() function. how to draw polygons using vtkPolyData. When using eight parameters, the latter four set the radius of the arc at each corner separately, starting with the top-left corner and moving clockwise around the. Do you want to draw a polygon? Polygons are figures consisting of line segments in a closed chain. We use a curve with roots of -1,0,+1. 2D__ component is a Collider for use with 2D physics. Frequency polygons are also a good choice for displaying cumulative frequency distributions. A call to this function is blocking, that is the program continues as soon as the user closes the window (a version exists for polygon with holes, cf. Internally, a polygon comprises of a list of (x,y) coordinate pairs, where each pair defines a vertex of the polygon, and two successive pairs are the endpoints of a line that is a. Hi everyone, How do I draw a transparent ploygon overlaying with a scatter plot? Let's say, we call plot() to have a scatter plot, then call polygon() to add a polygon. Procedure: The data for this experiment are the three vectors (A, B, and C), as "Given" the Table 2 below. In other words, the cumulative percents are added on the graph from left to right. draw polygon based on user input - turtle python. To draw this polygon, we also have to draw the path object choice. 0 in Theta 2 = 135 degree; dot Theta 2 = 120 rpm CW. To use a different radius value for each corner, include eight parameters. Html5CanvasPolygon. You may also wish to build a custom block to draw a rectangle of given length and width. We want to assemble and return a structured object that can be used by Spotfire to draw the polygon; the "Form the output table" section of the R script above does this. For n ≥ 1, let nP = {nα : α ∈ P}. There is plenty more out there. Rectangles, right trapezoids, and loads of other polygons have perpendicular line segments (including right triangles, which are special enough to have an entire chapter named after them). For this example, choose Select features by rectangle. A triangle is a polygon with three sides. The vertices of the Thiessen polygon are at the location, at which the bisectors intersect. Row coordinates of vertices of polygon. Intermediate: Allow students to plan their picture by discussing with a partner before beginning to draw. The frequency polygon is a special line graph used in statistics. A skew dodecagon is a skew polygon with 12 vertices and edges but not existing on the same plane. theta specifies a rotation angle in radian. Title: Area of Polygons Worksheet Author: Maria Miller Subject: Area of polygons worksheet Keywords: area, polygon, worksheet Created Date: 3/9/2020 6:59:03 PM. A regular polygon is one that is both equilateral and equiangular. Frequency histogram and polygon The frequency histogram is like a column graph without the spaces between columns. It is used in computer graphics (especially 2D graphics) to reduce the complexity of a scene being displayed by eliminating parts of a polygon that do not need to be displayed. A data function that inputs a table of coordinates representing polygons, and outputs a table with the polygons in the format native to Spotfire, for rendering in a Feature Layer on a Map Chart. where the user experience and workflows are identical to Community Analyst. In code, it looks like this:. The positions supplied, i. With SVG we have two options for this: or. These fill a region if the polygon border encircles it an odd or non-zero number of times, respectively. sfd Convert polygon coordinates to polygon geometries. I don't really mind about it, i just need to draw a polygon (different types) based on some input fields. And whether draw polygons is free samples, or paid samples. 262 CHAPTER 5 Discovering and Proving Polygon Properties If someone had told me I would be Pope someday, I would have studied harder. From any vertex of a 5 sided-polygon, two diagonals can be drawn. Click on the map and draw a rectangle, for selecting all your polygons at once. If different segments of a polygon share boundary with different polygons, the boundary will be split such that each uniquely shared segment will become a line with its two neighboring polygon FIDs stored in the output. This function uses the current graphics scales. On the other hand, R, a free and open-source software development environment (IDE) that is used for computing statistical data and graphic in a programmable language, has developed advanced spatial capabilities over the years, and can be used to draw maps programmatically. Build, create and embed interactive Google maps with drawings and labels. NET Forums / General ASP. We could have read the elements as col['r'] or col. If you do not use a canvas before, you should…. How to map point data and polygon shapefiles in R December 20, 2018 December 20, 2018 Aleszu Bajak Data Journalism in R , How to I recently published a series of interactive maps for Beeradvocate magazine that explored storm surge scenarios and low-lying breweries in Boston, New York City, Charleston and Miami. EXTRA PRACTICE. As a result, the shapes are embedded in the output image. Had I done this with a polygon it would still be two polygons and not one. r is the radius (circumradius) n is the number of sides cos is the cosine function calculated in degrees (see Trigonometry Overview) Irregular Polygons Irregular polygons are not thought of as having an incircle or even a center. Do you want to merge features of to combine them into one feature and to maintain its database dbf values along with it. Shading lines are handled internally by R according to the fillOddEven argument. plot(lnd) # not shown in tutorial - try it on your computer. I have used xyplot (from the lattice package) successfully to plot 36 time-series plots (lines) of under-5 mortality for a set of countries in Sub-Sarahan Africa. angle of fill pattern. Polygons are named according to the number of sides and angles they have. So, for anyone else scratching his or her head over polygon (and so I can find it again when I forget how it’s done), here are the. Vijayan and Wigderson [14] considered the problem of e ciently drawing rectilinear graphs, of which rectilinear polygons are a special case, using an edge labeling that is equivalent to a turn sequence in the case of paths and cycles. If enabled, an offset is added to depth values of a polygon's fragments before the depth comparison is performed, if the polygon is rendered in GL_POINT mode. The user draws (by clicking) several small circles, and finish his polygon by hitting the Draw polygon button. dwg file, which is open at the moment, but what I've done is I've. • Conquer: find closest pair in each side recursively. The following are code examples for showing how to use matplotlib. Here are step-by-step instructions how to clip rasters using two techniques in ArcGIS. Giving the node the name a, the vertices will be named a. Looking for the perfect home in Virginia Beach, VA? Begin your home search here. The polygons for drawing the administrative boundaries were obtained from this link. One solution is to use a pair of sketch polygons for each zero-thickness face, identical except with opposite vertex orders. Otherwise, the obtained number of points will have expected value n. Next, we can read the. This example creates a map with a simple polygon representing the Bermuda Triangle. I was hoping the polygon can be transparent so the scatter plot is still visible. In drawing n7, the area of Q 1 is too large, roughly 124% of the area of its reference polygon, Q R, while in drawing j4, the area of Q 1 is too small, roughly 41% of the area of its reference polygon Q R. Open Google Earth Pro. uk), James Cheshire, Rachel Oldroyd and others plotsusethegeometry data,[email protected] slot. Two general consideration: First, spatial polygons require a list of lists. Frequency polygons give an idea about the shape of the data and the trends that a particular data set follows. The section "Close the polygon" simply replicates one of these indices so that the resulting polygon will contain one repeated point, closing on itself. BrainPOP ELL BrainPOP Educators Visit Open Menu Close Menu Visit. Product support Contact us For compelling visuals, Code-Point with polygons lets you apply shading to individual postcodes on a map. uk), James Cheshire, Rachel Oldroyd and others geographicattributedata)and. The broadest term we've used to describe any kind of shape is "polygon. This is an example of an open polygonal line: A polygon is closed when the segments do connect at the beginning and end. Thanks, Annie-Marie, for sharing the Modifying Polygon Shapes” InDesign CS2 tip! Hooray!! It’s a shame the program was created without an easier modification option. Html5CanvasPolygon. The present shading algorithm can produce incorrect results for self-intersecting polygons. Frequency polygons are also a good choice for displaying cumulative frequency distributions. Properties of Polygons See also: Calculating Area. The purpose is to find the following resultants: R 1, R 2, and R 3 (one at a time) using the polygon method as shown in Table 1. The number of sides and the radius can be entered via a file, STDIN, or just a plain old variable. Self-intersecting polygons may be filled using either the "odd-even" or "non-zero" rule. If you use these images in your publication, we do request that you include a credit line for Robert Savannah, U. Constructing regular polygons accurately is very significant in geometry and is easy to do. Some graphs may omit some of the axis or titling steps, but the majority will only differ in what is drawn inside the central plot region. The Graphics class is the abstract base class for all graphics contexts that allow an application to draw onto components that are realized on various devices, as well as onto off-screen images. Then, click the Star Ratio handle in the upper right corner of the polygon, and drag in towards the radius. A frequency polygon is very similar to a histogram. Presumably, you already know how to create the data for the histogram and the histogram itself. I've added this link back to that page here, since this page comes up so high on Google's search. In contrast, the drawpolygon function creates the ROI object and calls the draw object function for you. Example of different containers for the same object, a polygon, are shown in the diagram: Linear Containers. In the ground truth photograph, the area of Q 1 is virtually identical to the area of its reference polygon, Q R. Use whatever is shorter in your language. Self-intersecting polygons may be filled using either the "odd-even" or "non-zero" rule. Figure 3: Frequency Polygon in R. Non-closed polygons will be treated as implicitly closed. A boundary thickness of 1 pixel, Polygons that are colored with the nc_pal palette and are highlighted on hover, and. Description Usage Arguments Details Value References See Also Examples. To make a path or polygon into a 3D object, click Altitude. You can create your own custom shapes by using the rectangle, ellipse, arc, freeform, and pencil shapes in Visio. /r/javascript: X-post from /r/webdev: Interactively drawing complex polygons using Raphael, how to make it user-friendly ? This comment was posted by a bot, see /r/Meta_Bot for more info. Check out the course here: https://www. For example, you can create a series of noncontiguous island polygons and store them as one island feature. We have step-by-step solutions for your textbooks written by Bartleby experts!. You may need to move it out of the way before moving on to the next step. Area of a circle inscribed in a polygon. In contrast, the drawpolygon function creates the ROI object and calls the draw object function for you. A polygon is open when the segments do not all connect at the beginning and end. Online graphing calculator that allows you to graph / draw the figure of a Seven (7) Sided Polygon / Heptagon with the given radius. The first and final pairs of (x,y) points are joined by a line segment that closes the. For example, a closed figure formed with three straight lines is termed as triangle whereas a shape formed with four straight lines is known as a quadrilateral. How to calculate the polygon area using R? I have a lot of longitude and latitude information for several polygons. The featureGroup can contain 0 or more features with geometry types Point, LineString, and Polygon. The Draw Polygon dialog box opens on the left. Call GoogleMap. To install this R package, run this command at your R prompt: install. From any vertex of a 4 sided-polygon, one diagonal can be drawn. The simplest regular polygon is the equilateral triangle, which consists of three edges of equal length and three angles between each pair of edges to be 60 degrees. Your goal is to create a map where each ward is colored by one of your summaries: the number of sales or the average sales price. Includes worksheets the require students to draw lines of symmetry, determine which pictures are symmetrical, and design symmetrical illustrations. Categories. Drawing polygons. This is the key point in our algorithm to draw regular HTML5 Canvas Polygon. These fill a region if the polygon border encircles it an odd or non-zero number of times, respectively. This function uses the current graphics scales. Set operations on polygons will treat the polygons as areas. Fish and Wildlife Service. You can vote up the examples you like or vote down the ones you don't like. Polygon: A polygon is a closed planar figure made by joining line segments. Frequency polygons give an idea about the shape of the data and the trends that a particular data set follows. I has 4 line equations. Presumably, you already know how to create the data for the histogram and the histogram itself. The Production Points To Line Or Polygon tool allows you to choose a method for determining the draw order, then creates the line or polygon accordingly. A complex polygon consists of closed rings that represent each part of the polygon, such as the outer boundary or a hole. A polygon is open when the segments do not all connect at the beginning and end. But now I can't draw all polygons on leaflet map (filled polygons) like filled. Either a fixed color is used, or a color palette is mapped to a data variable. tm_polygons fills the polygons and draws the polygon borders. To make a path or polygon into a 3D object, click Altitude. Polygon definition, a figure, especially a closed plane figure, having three or more, usually straight, sides. draw does not work with multigeometry features such as MultiPoint, MultiLineString, MultiPolygon, or GeometryCollection. Pass the locations/points as variable to draw the polygon, and an option to specify the color of the polygon. For a long time, R has had a relatively simple mechanism, via the maps package, for making simple outlines of maps and plotting lat-long points and paths on them. Read in the point and polygon data. I don't really mind about it, i just need to draw a polygon (different types) based on some input fields. You will draw each tile with your polygon method. Regular polygons use line segments that form sides enclosing a. This is the key point in our algorithm to draw regular HTML5 Canvas Polygon. All the angles are congruent in an equiangular polygon. So, the measure of the interior angle of a regular octagon is 135 degrees. Starting with the polygon on the left, the center polygon is rotated clockwise 90°, the right one is flipped vertically. Check out the course here: https://www. We need to go forward some distance, then draw the polygon. Digital Differential Analyzer Line drawing algorithm (1) Flood Fill Algorithm (1) Install Turbo C (1) Liang Barsky Line Clipping Algorithm (1) Mid-Point Ellipse Drawing Algorithm (1) new folder. The quadratic equation for the given pair of solutions. Relations between sides and radii of a regular polygon. In this tutorial we will learn how to draw line, tringle,ellipse,polygon in 2D graphics. r Construct polygons given measure of sides. shape tuple, optional. Creating Shapefiles - Drawing lines, points or polygons (vectors) in ArcGIS. The trick now consists of expressing our region of interest as a polygon. Frequency histogram and polygon The frequency histogram is like a column graph without the spaces between columns. How to perform it in R software?. In the figure below, all three polygons are similar. Result will be displayed. Using drawPolygon() with arrays. Output options: A shapefile or KML file with vector features. Is there a way to also mark the area. can anyone help on how to do thi. Irregular. This is how they are alike, but what makes them different?. Returns a polygon which is the intersection of this polygon and r. Leaflet makes it easy to take spatial lines and shapes from R and add them to maps. Click on the map and draw a rectangle, for selecting all your polygons at once. You may also wish to build a custom block to draw a rectangle of given length and width. For example, if you want to prevent users from drawing graphics with self-intersecting lines or overlapping polygons, then you can use this class to implement these rules. Maps with R, and polygon boundaries. pi, we have to import math. 1BestCsharp blog Recommended for you. Non-closed polygons will be treated as implicitly closed. C (b) 3cm 50 º 50 º P Q R 50 º K (c) 70 º 4cm 7cm J L (a) 5cm 4cm 6cm A B 24. If your elevation measurement reads "0," make sure the terrain layer is turned on. j a v a 2 s. By default once we have finished drawing a polygon, if we wanted to draw another, we would need to click on the polygon tool on the toolbar to start again. You can vote up the examples you like or vote down the ones you don't like. Click the Freehand tool on the Create Features window. In the Canvas tutorial 02, I tell you how to implement the round angle polygon with points, But if we want to draw a regular polygon with that way, we must have many points, for example, we want to…. Frequency polygons give an idea about the shape of the data and the trends that a particular data set follows. A skew zig-zag dodecagon has vertices alternating between two parallel planes. So, for anyone else scratching his or her head over polygon (and so I can find it again when I forget how it’s done), here are the. The following example shows how a data frame can define multiple polygons (in this example, two polygons). How do I do that?. Here’s the code. A linear container is one whose interior is specified by a finite number of linear inequalities. We also focus on the definition and classification of lines and angles. To reshape a polygon by sketching or drawing over an image, just use the Sketch tool to draw a sketch of the reshaped line. Polygon feature classes contain the vector geometry of a feature and its descriptive attributes. Digital Differential Analyzer Line drawing algorithm (1) Flood Fill Algorithm (1) Install Turbo C (1) Liang Barsky Line Clipping Algorithm (1) Mid-Point Ellipse Drawing Algorithm (1) new folder. For this example, choose Select features by rectangle. 30 minutes : Drawing a frequency polygon. This is the key point in our algorithm to draw regular HTML5 Canvas Polygon. A call to this function is blocking, that is the program continues as soon as the user closes the window (a version exists for polygon with holes, cf. One limitation of this solution is that n is a constant, which means that for very big circles, the line segments are too long, and for small circles, we waste time drawing very small segments. Recall that a polygon is a closed figure in a plane formed by segments called sides. The numOfPoints gives the number of points to join. draw polygon based on user input - turtle python. (If you do not have a drawing toolbar, go to View - Toolbars - Draw) This example will be using the circle. They are from open source Python projects. It is used in computer graphics (especially 2D graphics) to reduce the complexity of a scene being displayed by eliminating parts of a polygon that do not need to be displayed. Often, GIS users perform a common task of counting the number of point features that are contained in a polygon. Do you want to draw a polygon? Polygons are figures consisting of line segments in a closed chain. View source: R/tm_layers. In the ward_sales data frame, you have information on the house sales summarised to the ward level. This is what I have: a polygon shapefile of a sidewalk system for a university. The angles have been calculated manually. Drawing regular polygons in OpenGL. Input options: Any georeferenced image file or WMS layer containing features you would like to trace. Plot the ordered pairs on the Point A is a vertex of a polygon. Polygon Patterns Source: Algebra I NCSCOS Indicator 1. I found someone using Canvas and someone using SVG. I am missing Draw Polygon tool and others from my list of markup tools. Commented: Sophie on 3 Mar 2017 Accepted Answer: Azzi Abdelmalek. DoodleCAD is designed to be both powerful and intuitive. In the loop we initial or update three keys 'r', 'g', and 'b'. gfxdraw module differs from the pygame. See what they look like, how many sides they have and learn some cool trivia. polygon-draws:. From any vertex of a 5 sided-polygon, two diagonals can be drawn. Drag the pointer in the shape you want. Symmetry Worksheet FREE Part 1: Tell whether the dotted lines on the shapes are lines of symmetry. A wide range of graphs can be created by a similar sequence of simple steps. The polygon button is used to draw multi-sided shapes. The length of its sides can be calculated using trigonometry. The number of sides and the radius can be entered via a file, STDIN, or just a plain old variable. We have basic area of rectangles and square worksheets, drawing areas and perimeter worksheets, areas in grids worksheets, area of compound shapes, find the length of an unknown side given either the area or the perimeter of a shape, area of triangle worksheets, area of triangular shapes worksheets, area of regular polygons worksheets, circle. A polygon with 22 sides has 22 angles whose sum is 3600 degrees. See what they look like, how many sides they have and learn some cool trivia. The purpose of these shapes is fairly obvious from their names. In the ground truth photograph, the area of Q 1 is virtually identical to the area of its reference polygon, Q R. In a computer graphics display system, a method and processor are disclosed for drawing a `polygon with edge`-type primitive encountered in certain high level graphics interface programs. Area is always expressed in square units, such as c m 2, f t 2, i n 2. The Draw Shapes block draws rectangles, lines, polygons, or circles on images by overwriting pixel values. Read in the point and polygon data. as3 drawing shapes (arc, burst, dashed-line, gear, polygon, star, wedge, line) / Published in: ActionScript 3 Credit for this goes to Adobe, Ric Ewing, Kevin Williams, Aden Forshaw and Sidney de Koning. The polygon segments are drawn in the order in which they occur in the data. You can draw a polygon around your area of interest. The Sutherland-Hodgman clipping algorithm finds the polygon that is the intersection between an arbitrary polygon (the “subject polygon”) and a convex polygon (the “clip polygon”). This may be a new word to you, but the apothem (pronounce it like APP-uh-them) is the distance of a perpendicular line from any side of the polygon to its center. Enter value and click on calculate. Interactive Creation. The figure is a polygon formed by four straight sides.