26.15.2  Checking whether three points are collinear in the plane

See Section 27.11.6 for checking for collinearity in 3D geometry.

The is_collinear command determines whether or not three points are collinear.

• is_collinear takes three arguments: A,B,C, three points.
• is_collinear(A,B,C) returns 1 if A,B and C are collinear and 0 otherwise.

Examples