Solid Geometry Polyhedron A polyhedron is a solid with flat faces (from Greek poly- meaning "many" and -edron meaning "face"). Each flat surface (or "face") is a polygon. So, to be a polyhedron there should be no curved surfaces. Non-Polyhedra - Some solids have curved surfaces, or a mix of curved and flat surfaces (so they aren't polyhedra).

Solid Geometry Solid Figures Polyhedra- Solid figure with all faces being flat and polygons. pyramidsprisms Non-Polyhedra – Solid figure with curved or a mix of flat and curved surfaces. CylindersConesSpheres

Polyhedra - Prisms No Curves! A prism is a polyhedron, which means the cross section will be a polygon (a straight- edged figure)... so all sides will be flat!polyhedronpolygon

Examples of Polyhedra Cube Triangular Prism Dodecahedron

Polyhedra - Pyramids A pyramid is a polyhedron with a polygonal base and triangles for sides. A pyramid is made by connecting a base to an apex

There are many types of Pyramids, and they are named after the shape of their base. Triangular Pyramid Square Pyramid Pentagonal Pyramid

Non-Polyhedra - Some solids have curved surfaces, or a mix of curved and flat surfaces (so they aren't polyhedra). Cone Cylinder Sphere