Polyhedron
"polyhedron" is referenced in the pages listed below.
Definition of the math word 'face' as it applies to geometric solids (polyhedra).
Definition of the math word edge 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 and properties of a pyramid  a polyhedron that has a base and triangular faces meeting ata a point.
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