The center of the circle for which point lies on the circumference.
radius
The radius of the circle for which point lies on the circumference.
invertPerpendicular
Whether or not to invert the result to use X/Y or Y/X.
Return Value
The angle.
Requirements
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2