Which of the following does not have triangular faces? A. icosahedron B. octahedron C. tetrahedron D. hexahedron

The option that does not have triangular faces is D) hexahedron, whereas icosahedron, octahedron, and tetrahedron do.

A regular icosahedron is a 3D convex polyhedron with 20 faces, 30 edges and 12 vertices while a regular octahedron has 8 faces. A tetrahedron has 4 faces and is shaped like a pyramid. All of these have triangular bases. A regular hexahedron has six faces and a base of a square