It's a polyhedron.
A polyhedron (plural: polyhedra) is a three - dimensional figure made up of sides called faces, each face being a polygon.
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It is called a polyhedron.
A solid cannot be bounded by one polygon. A solid bounded by polygons is called a polyhedron.
No. A polygon is a plane area bounded by straight lines. The key term in this context is "plane". It is, therefore, 2 -dimensional shape. A solid, which is bounded by faces that are polygons, is called a polyhedron (plural = polyhedra).
A pyramid, as well as any other solid figure bounded by plane polygons or faces, is a polyhedron.
A polyhedron is a generic term to describe a closed 3-dimensional (solid) shape that is bounded by polygons. It can have 4 or more faces - any number.