Faces | The faces of a polyhedron are polygons. |
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Edges | The edges of a polyhedron are formed where common
sides of neighboring polygons meet. |
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Vertex | A vertex of a polyhedron is a point where edges
intersect. Three or more polygons must meet at each vertex. |
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Dihedra Angles | A dihedral angle is the angle formed by two polygons joined
along a common edge. | top | |

Convex Polyhedron | A polyhedron is convex if every dihedral angle
is less than 180 degrees. | top | |

Concave Polyhedron | A polyhedron is concave if at least one of its dihedral
angles is more than 180 degrees. | top | |

Uniform | A polyhedron is uniform if all of its
vertices are the same or congruent | top |