Since engine version: 1.0 OC
Calculates arc cosine of value/radius, or x = arccos(value/radius). This corresponds to cos(x) = value/radius. This function is used to calculate an angle from horizontal and vertical offsets. However, in most cases Angle() does what you need.
int ArcCos(int value, int radius);
- Length of the adjacent leg
- Length of hypotenuse