Unit 11 Contents

Read each description. Predict how to make the changes. Then make the shapes described with full-length and half-length straws.

1. Look at the cube you made with full-length straws. Change some of the straws to make a rectangular prism.
1. What did you change?
2. How did the number of vertices change?
3. How did the shape of the faces change?
4. How did the number of edges change?
5. Complete the table for the rectangular prism on the Edges, Vertices, and Faces page in the Student Activity Book.
2. Look at the square pyramid you made with full-length straws. Look at the four straws that make the square base of the pyramid. Change them to half-length straws to make a different pyramid.
1. What do you think this new pyramid is called?
2. How did the faces of the pyramid change?
3. Look at the square pyramid you made in Question 2. Change some of the straws to make a triangular pyramid.
1. What did you change?
2. How did the number of vertices change?
3. How did the shape of the faces change?
4. How did the number of edges change?
4. Look at the triangular pyramid you made with full-length straws. Change only one straw to a half-length straw to make a different pyramid.