1. 1. True or false: If the height of a rectangle equals the base of a parallelogram and the base of the rectangle equals the height of the parallelogram, then the rectangle and the parallelogram have the same area. 2. Find the area of a rectangle with a length of 53 in. and a width of 47 in. True 2,491 in 2 Do Now

2. 3/30/2015 9-1 C Area of Triangles

5. Example 1 Find the area of the triangle. A = 1212 bh A = 1212 (20 · 12) The area is 120 ft 2. A = 1212 (240)

6. Example 2 Find the area of the triangle. A = 1212 bh A = 1212 (30 · 24) The area is 360 in 2. A = 1212 (720)

7. Example 3 The diagram shows the section of a forest being studied. What is the area of the section? A = 1212 bh A = 1212 (43.9 16) The area is 351.2 km 2. A = 1212 (702.4)

8. Example 4 Find the area of the triangle. By counting, you find that the measure of the base is 5 units and the height is 8 units. A = 20 The area of the triangle is 20 square units.

9. Example 5 Find the area of the triangle. A = 64 The area of the triangle is 64 square centimeters.

10. Example 6 Find the height of the triangle.

11. Find the area of each triangle. 1. 3. 84 mi 2 2. 4. 39.9 cm 2 Exit Ticket

12. Homework Pg. 532 #1-24 Evens