Polyhedra and spatial polygons
Overview
Important
A polyhedron is a three-dimensional solid bounded by flat polygonal faces, with straight edges and vertices. A spatial polygon is a sequence of points (vertices) in space connected by straight line segments (edges), where the points do not all lie in the same plane.
Important properties
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Each face of a polyhedron is a polygon.
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The edges of the faces meet at vertices.
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Polyhedra can be classified by the types and numbers of their faces (e.g., regular, semi-regular).
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Spatial polygons generalize planar polygons to three dimensions; they may be non-planar.