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Polyhedron

"polyhedron" is referenced in the pages listed below.

Definition and properties of a pyramid - a polyhedron that has a base and triangular faces meeting ata a point.
Definition of the math word 'face' as it applies to geometric solids (polyhedra).
Animated demonstration and properties of an icosahedron - a regular polyhedron with 20 faces. One of the 5 platonic solids
Difference between a right pyramid and an oblique pyramid.
Definition of the math word edge as it applies to geometric solids (polyhedra).