By Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N. Friel, Elizabeth Philips

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1. Find the area of each rectangle. Record your data in a table with columns labeled for the triangle name, the area of the rectangle, and the area of the triangle. 2. Use the data in your table. Compare the area of the rectangle and the area of the triangle. Describe a pattern that tells how the two are related. C. Use your results from Question B. Write a rule to find the area of a triangle. Homework starts on page 44. 2 More Triangles Base and height are two words that describe triangles. The base of a triangle can be any one of the sides of the triangle.

Describe a pattern that tells how the two are related. C. Use your results from Question B. Write a rule to find the area of a triangle. Homework starts on page 44. 2 More Triangles Base and height are two words that describe triangles. The base of a triangle can be any one of the sides of the triangle. “Base” also refers to the length of the side you choose as the base. The height of a triangle is the perpendicular distance from the top vertex to the base. You can think of the height of a triangle as the distance a rock would fall if you dropped it from the top vertex of the triangle straight down to the line that the base is on.

3. 4. qxd 5/16/05 11:54 AM Page 45 5. 6. 7. Find the area of each figure. ) a. For: Multiple-Choice Skills Practice Web Code: ama-5354 b. 3 cm 3 cm 13 cm 5 cm 8m c. d. 2 ft 10 m 7 ft 10 ft 8. Vashon said that if you used 7 feet as the base for the triangle in Exercise 7(d), you would calculate the same area as you did when you used the 10-foot base. Do you agree with him? Explain. 9. 1, find a base and corresponding height. a. Use these values to find the area of each triangle. b. 1. What do you notice?