Computes the angle (in radians) between the axis and the
side of the cone.
The angle and the height have the same sign.
RhinoCommon (in RhinoCommon.dll)
public double AngleInRadians()
Public Function AngleInRadians As Double
Math.Atan(Radius / Height) if the height is not 0; 0 if the radius is 0; Math.PI otherwise.