title: Line Segment Circle Intersection
body: <p>I am trying to determine the point at which a line segment intersect a circle.  For example, given any point between P0 and P3 (And also assuming that you know the radius), what is the easiest method to determine P3?</p>
  
  <p><img src="https://i.stack.imgur.com/I78pj.png" alt="Circle"></p>