All angles are measured in radians. So, if you have an angle in degrees, you have to translate it to radian using the formula:
Ang_rad = ang_degree / 180 * VECT_PI;
Where VECT_PI is defined in vectapi.h
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| ImageGear Professional v18.1 > User Guide > Using ImageGear > Working with Vector Images > General Concepts of the ImageGear Vector API > Angles |