Can a polyhedron have for its faces
(i) 3 triangles?
(ii) 4 triangles?
(iii) a square and four triangles?
Since a polyhedron is a solid, which is bounded by four or more polygonal faces in such a way that pairs of faces meet along edges and three or more edges meet in each vertex, therefore,
(i) A polyhedron cannot for its faces have three triangles.
(ii) A polyhedron can for its faces have four triangles.
(iii) A polyhedron can for its faces have a square and four triangles.