A polyhedran is a 3D solid figure with a flat surface.

A polyhedran does not have any curved surfaces.

Polyhedron is derived from **poly**=many

Is a **Dodacahedron** a polyhedron? yes

Is a triangle a polyhedron? No it is only 2D

Is a sphere a polyhedron? No it has curves

Is a coffee mug a polyhedron? No it has curves

Some common examples of polyhedron are prisms and pyramids.