the word means a solid containing many sides or planes. ('many' from the words prefix of poly) by further explanation, if your word was Hexahedron, that would be six sided like a cube
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Nope - A polygon is a flat, 2-dimensional shape. A Polyhedron is a 3-dimensional shape.
The answer is a polyhedron
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
Yes. A polyhedron is a geometric shape with flat surfaces and straight edges, so a a pyramid with a rectangular base qualifies as a polyhedron. It is however not a regular polyhedron, which would require all the faces to be the same shape and size. To change your pyramid to a regular polyhedron you'd have to turn it into a tetrahedron.
polyhedron