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The regular convex polyhedra are the five Platonic solids ... there are only five Platonic solids – the regular tetrahedron (four sides that are equilateral triangles), the cube (six sides that are ...
A 3D shape with all straight edges and flat faces is a polyhedron ... a triangular base is a triangle-based pyramid. A tetrahedron is a triangular pyramid with all equilateral triangle faces.
A polyhedron with eight vertices that had more volume than any other eight-vertex shape previously known.” He adds: “It is ...