title: Find arc's mid-point given start, end, and center (of circle) points
body: <p>I'm looking for some help on how to find an arc's mid-point. I have the start and end points, center of circle, and radius. I've searched everywhere online and cannot find an answer that I can convert into code anywhere. If anyone has any ideas, please let me know. The following picture is what I'm trying to find (assume that the center of the circle is already found).</p>
  
  <p><img src="https://i.stack.imgur.com/aXO2Q.jpg" alt="Find Midpoint?"></p>