A polyhedron is a solid shape with many sides. The word "polyhedron" does not specify a number of sides.
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A polyhedron with a polygonal base and triangles for sides.
A tetrahedron has 4 vertices and 4 sides. Each side is an equilateral triangle. * * * * * Each face is an equilateral triangle only if it is a regular tetrahedron; there is no reason to assume it is.
A standard pencil has 6 sides.
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