# How to Draw N-sided Regular Polygons [1/11]

## How to Draw Regular Polygons

This tutorial explains how to draw regular polygons with a computer program. This is a detailed step-by-step guide, featuring many examples. The provided explanations are valid for drawing regular polygons in any programming language.

### Start

To start simple, the provided program only draws one red disc and one green arrow.
[Run the program by clicking the 'Run' button]

The first statement of the program sets the center of the red disc to be at coordinates 480 , 360 , which are at the center of the output image. A red disc of radius 20 is then drawn to visualize the center point.

The sleepMs function then makes a small delay, so that the red center point can be easily observed.
[Run the program by clicking the 'Run' button]

### The Vector Up

The next statement sets the variable size to equal 200 pixels. Then the vector v is created, of length equal to size.

The vector v is then visualized in the green color by the function DrawArrow . Surprisingly, the vector v has a direction up. In 2D computer graphics, the y coordinate is always reversed upside-down, meaning that the y coordinate increases downwards.
[Run the program by clicking the 'Run' button]

[Click on the 'Next' button (on the page top) to read the next page, or press the F4 key]

• Run
• Check
• HideMsg

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