title: WPF Math for semi circle using ArcSegment between two arbitrary points
body: <p>Can someone show the math for drawing a semi circle between two arbitrary points using an ArcSegment in WPF. </p>
  
  <p>I am quite confused with the RadiusX, RadiusY in the ArcSegment. It does not seem to be relative to the two points but rather to the X and Y axis. Is that how it really should be?</p>