NAME: Arc

     USE:  Procedure to draw a circular arc from a specified start angle
           to a a specified end angle, using (X,Y) as the center point
           and Radius as the radius of the arc.  The arc is drawn in
           with the current drawing color.  Using a start angle of 0
           and an end angle of 359 will draw a complete circle.

     DEPENDENCY: Must be in graphics mode prior to calling arc.

     SYNTAX:  Arc(X, Y : Integer; StartAngle, EndAngle, Radius : Word);

     EXAMPLE:  Arc(100, 100, 0, 89, 50);