26.15.3  Checking whether four points are concyclic in the plane

See Section 27.11.7 for checking for concyclicity in 3D geometry.

The is_concyclic command determines whether or not points are cyclic.

• is_concyclic takes L, a list or sequence of points.
• is_concyclic(L) returns 1 if the points in L all lie on the same circle, and 0 otherwise.

Examples