MathDB

56

Part of 1977 IMO Longlists

Problems(1)

Faces of the tetrahedron are congruent triangles-[ILL 1977]

Source:

1/11/2011
The four circumcircles of the four faces of a tetrahedron have equal radii. Prove that the four faces of the tetrahedron are congruent triangles.
geometry3D geometrytetrahedroncircumcirclegeometry unsolved