1. 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).

2. 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

3. 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

4. Examples of Polyhedra Cube Triangular Prism Dodecahedron

5. 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

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

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