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Polyhedrons

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Polyhedrons
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Vocabulary

polyhedron

polyhedron

A 3-dimensional figure that is formed by polygons that enclose a region in space. Each polygon in a polyhedron is a face.
regular polyhedron

regular polyhedron

A polyhedron where all the faces are congruent regular polygons.
Polygon

Polygon

A polygon is a simple closed figure with at least three straight sides.
Sphere

Sphere

A sphere is a round, three-dimensional solid. All points on the surface of a sphere are equidistant from the center of the sphere.
Tetrahedron

Tetrahedron

A tetrahedron is a shape with a triangular base and sides, also correctly described as a triangular pyramid. There are 4 faces, 6 edges and 4 vertices in a regular tetrahedron.

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