title: How to draw a angle (three points) in WPF?
body: <p>I plan to create a software about drawing angles. And I really have no idea about how to represent the correct three point position.</p>
  
  <p>For example, I need a someway that I introduced the value 90, I get the righ position of the three point.</p>
  
  <p>Until the momment, I just need some help or ideas about how to draw correctly the line or points with XAML.</p>
  
  <p>Thanks.</p>
  
  <p><img src="https://i.stack.imgur.com/NSuU9.png" alt="enter image description here"></p>