Prove that a tetrahedron with vertices in the set of the vertices of the cube has the volume if and only if 3 of the vertices of the tetrahedron are vertices on the same face of the cube.
Patunayan na ang isang apsulok sa vertices sa set ng vertices ng kubo ay may lakas ng tunog at kung lamang kung 3 ng vertices ng apsulok ay vertices sa parehong mukha ng kubo.