CGAL::squared_radius

FT	squared_radius ( Point_2<R> p, Point_2<R> q, Point_2<R> r)
		compute the squared radius of the circle passing through the points $$p, $$q, and $$r. Precondition: $$p, $$q, and $$r are not collinear.
FT	squared_radius ( Point_3<R> p, Point_3<R> q, Point_3<R> r)
		compute the squared radius of the sphere passing through the points $$p, $$q, and $$r and whose center is in the same plane as those three points.
FT	squared_radius ( Point_3<R> p, Point_3<R> q, Point_3<R> r, Point_3<R> s)
		compute the squared radius of the sphere passing through the points $$p, $$q, $$r and $$s. Precondition: $$p, $$q, $$r and $$s are not coplanar.

See Also