## CHAPTER 11: 2-D AND 3-D GEOMETRY

**Lesson 3: Finding Lines and Faces in the Media **

**Goal**

Identify relationships between lines in 2-D faces and faces in 3-D objects.

**Instructions for Use**

**3-D Solids**

Click on either “Prisms” or “Pyramids” and then click on a shape you wish you see. Determine how many edges, vertices, and faces there are. Place the shape in one position: How many edges are horizontal in this position? How many are vertical? How many faces are horizontal? How many are vertical?

**Geometric Solids**

Manipulate and color each shape to explore the number of faces, edges, and vertices. Click “New Shape” to get another shape. For each shape determine which faces and which edges are vertical and which are horizontal.