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   ocr: SOLID FIGURES ATHEMATICIANS have for D Mcenturies puzzled over the properties ofsolid figures. The solid figures most easily categorized are called polyhedra. Only five regular polyhedra exist. They are the tetrahedron (four triangular faces), the cube (six square faces), the octahedron (eight triangular faces), the dodecahedron (12 five- sided faces), . and the icosahedron (20 triangular faces). REGULAR POLYHEDRA TETRAHEDRON CUBE OCTAHEDRON DODECAHEDRON COSMHEDRON SEE SPHERES PYRAMIDS ALSO