angle_between_points#
- angle_between_points(z1, z2, z3)#
Return signed angle (degrees) at z2 determined by points z1–z2–z3.
Positive means left turn, negative right turn; 0 means collinear.
- Parameters:
z1 (complex) – First point.
z2 (complex) – Vertex point.
z3 (complex) – Third point.
- Returns:
float – Angle in degrees in range (-180, 180].
- Return type:
float