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The polygons are the equilateral triangle, the square, and the regular pentagon. The faces of these platonic solids are made from the following polygons: tetrahedron - 4 triangles cube - 6 squares octahedron - 8 triangles dodecahedron - 12 pentagons icosahedron - 20 triangles
triangles, squares and pentagons.
You can actually learn to make an origami one. But its a 12 sided figure with each face having 5 sides in my past experience. A dodecagon is a 12-sided polygon, a 2-dimensional figure. The dodecahedron is a 12-sided polyhedron, a 3-dimensional object of 12 pentagonal faces and 20 vertices. The dodecahedron is also one of the Platonic solids. * * * * * The above is a totally confused answer. It conflates a a dodecagon and a dodecahedron. The first, which the question is about, is a plane (2-D) figure which is bounded by 12 straight lines. The second, which has nothing to do with the question, is a solid (3-D) shape enclosed by 12 pentagonal faces.
A four-faced solid is called a tetrahedron.
Rectangular Prism.