title: How to determine whether a point (X,Y) is contained within an arc section of a circle (i.e. a Pie slice)?
body: <p>Imagine a circle. Imagine a pie. Imagine trying to return a bool that determines whether the provided parameters of X, Y are contained within one of those pie pieces.</p>
  
  <p>What I know about the arc:</p>
  
  <p>I have the CenterX, CenterY, Radius, StartingAngle, EndingAngle, StartingPoint (point on circumference), EndingPoint (point on circumference).</p>
  
  <p>Given a coordinate of X,Y, I'd like to determine if this coordinate is contained anywhere within the pie slide.</p>