1. Ch 12 and 13 Definitions

2. 1. polyhedron A solid with all flat surfaces that enclose a single region of space

3. 2. face Each flat surface A cube has 6 faces

4. 3. edge Line segments where the faces intersect

5. 4. vertex The point where three planes intersect

6. 5. prism Polyhedron with two parallel congruent faces. Named by their bases! What shape are the sides?

7. 6. Regular prism A prism with bases that are regular polygons

8. 7. pyramid A polyhedron with all faces (except for one) intersecting at one vertex

9. 8. Regular polyhedron ALL of its faces are regular, congruent polygons and all edges are congruent

10. 9. Platonic solids Exactly 5 types of regular polyhedron Tetrahedron (4 equilateral triangles) Hexahedron (6 squares) Octahedron (8 equilateral triangles) Dodecahedron (12 regular pentagons) Icosahedron (20 equilateral triangles)

11. 10. Cylinder Solid (not polyhedron) with circular bases in a pair of parallel planes

12. 11. Cone (not a polyhedron) Has a circular base and a vertex

13. 12. Sphere A set of points in space that are a given distance from a given point.

14. What are the 2 parallel congruent faces of a prism called?

15. The faces of a prism that are not the bases are all __________________________________

16. Orthogonal drawings show two- dimensional views of the top, left, front, back, and right sides. top left front right back?! What is the 3-D shape?!