Returns the UCS 3D point at a specified angle and distance from a point
(polar pt ang dist)
A 2D or 3D point, depending on the type of point specified by pt.
Supplying a 3D point to polar:
Command: (polar '(1 1 3.5) 0.785398 1.414214)
(2.0 2.0 3.5)
Supplying a 2D point to polar:
Command: (polar '(1 1) 0.785398 1.414214)
(2.0 2.0)