Yes it is. It's faces are different polygon shapes such as square, triangle, etc....
To see images and builds of polyhedrons go to this site: korthalsaltes.com
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A pyramid, as well as any other solid figure bounded by plane polygons or faces, is a polyhedron.
It's a polyhedron. A polyhedron (plural: polyhedra) is a three - dimensional figure made up of sides called faces, each face being a polygon.
Its a platonic solid :)
A polyhedron with 20 faces is called an icosahedron.
It is called a polyhedron.