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WorldlyGlass49
The option that does not have triangular faces is D) hexahedron, whereas icosahedron, octahedron, and tetrahedron do.
meerkat18
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