There are five platonic solids, the tetrahedron, cube ... cross-section. A prism is named by the shape of its polygon cross-section. When the cross-section is a triangle, the prism is called ...

Triangles, squares, rectangles and pentagons are examples of polygons. A polyhedron is a 3D shape with faces made from polygons. Cubes, cuboids, tetrahedron and prisms are examples of polyhedra.