1. Splash Screen

2. Over Chapter 11 5-Minute Check 1 A.exactly one triangle B.more than one triangle C. no triangles Tell whether exactly one triangle, more than one triangle or no triangles are possible if the angle measures are 40° and 40° and the side length between those angles is 10 cm. ___

3. Then/Now You have already modeled three-dimensional figures. (Lesson 12–1a) Identify three-dimensional figures. Describe and draw vertical, horizontal, and angled cross sections of three-dimensional figures.

4. Vocabulary

6. Prism vs. Pyramid

8. Concept

9. Example 1 Identify Solids Identify the figure. Name the bases, faces, edges, and vertices. faces: GHJK, LMNP, GHML, HJNM, JKPN, GKPL Answer: This figure has two parallel congruent bases that are rectangles, so it is a rectangular prism. vertices: G, H, J, K, L, M, N, P edges: base edge vertex bases: GHJK and LMNP, face

10. Example 1 CYP Identify the figure. Name the bases, faces, edges, and vertices. Which listing is not accurate? A. rectangular pyramid with base: BCDE B. faces: ABC, ACD, ADE, AEB, BCDE C. D.vertices: B, C, D, E