title: Transcribing a polygon on a circle
body: <p>i am currently try to inscribe diagonals of a decagon inside a circle </p>
  
  <p>like this <img src="https://i.stack.imgur.com/7FuqZ.jpg" alt="enter image description here"></p>
  
  <p>in c# my approach would be creating a circle</p>
  
  <pre><code>e.Graphics.DrawEllipse(myPen, 0, 0, 100, 100);
  </code></pre>
  
  <p>and draw lines inside using</p>
  
  <pre><code> e.Graphics.DrawLine(myPen, 20, 5, 50, 50);
  </code></pre>
  
  <p>after that i would draw a decagon polygon.</p>
  
  <p>currently im stuck at how to divide the circle into 10 parts/ finding the correct coordiantes of the points on the circumference of the circles because im not good in math,
  i want to know how would i know the next point in a circumference of the circle the size of my circle is indicated above.<br>
  and also i want also to ask a better approach for my problem.</p>
  
  <p>Thank you :)</p>