A polyhedron has 12 faces and is such that:(i) all faces are isosceles triangles,
(ii) all edges have length either x or y,
(iii) at each vertex either 3 or 6 edges meet, and
(iv) all dihedral angles are equal.Find the ratio x/y. geometry3D geometrypolyhedronanglesEuler s TheoremIMO Shortlist