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   ocr: SOLID FIGURES ATHEMATICIANS have for D Mcenturies puzzled over solid the Dodecahedron Five-sided face properties ofsolid figures. The 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 CUEE OCTAHEDRON DOUECAHEDRON COSMHEDRON SEE SPHERES PYRAMIDS ALSO