title: How to join overlapping circles?
body: <p>I want to visually join two circles that are overlapping so that</p>
  
  <p><img src="https://i.stack.imgur.com/5SqXU.jpg" alt="AltText"></p>
  
  <p>becomes </p>
  
  <p><img src="https://i.stack.imgur.com/lNCnF.jpg" alt="alt text"></p>
  
  <p>I already have methods for partial circles, but now I need to know how large the overlapping angle for earch circle is, and I don't know how to do that.</p>
  
  <p>Anyone got an Idea?</p>