2. 11-1 Space Figures and Cross Sections Objectives To recognize polyhedra and their parts To visualize cross sections of space figures

3. A polyhedron is a space figure, or three-dimensional figures, whose surfaces are polygons. Each polygon is a face of the polyhedron. An edge is a segment that is formed by the intersection of two faces. A vertex is a point where three or more edges intersect.

4. Vertices: Edges: Faces:

5. Cross Section: the intersection of a solid and a plane You can think of this as a very thin slice of the solid.

6. Describe the cross section. The cross section is a rectangle. p. 691: 1, 3, 6-8, 18-20