1. Finding the Area of Right Triangles
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2. Warm Up Find the area. 2. 3. 4. 132in2 12in 35m2 5m 22in 14m 56in2 5cm
132in2
12in
35m2 5m
22in
14m
56in2
5cm
7in
9cm
22.5cm2
16in

3. Finding the Area of Right Triangles

4. To find the area of a triangle you multiply the base and the height and divide by 2.
In a right triangle the height and base make the right angle h b

5. Example 1: Find the area. A = (16in)(14in) ÷ 2 A = 112in2 14in 16in
16cm
A = 112in2
14in
16in

6. Example 2: Find the area.
A = (20cm)(22cm) ÷ 2
A = 220cm2
22cm
20cm

7. A = (12ft)(15ft) ÷ 2 A = 90ft2 Example 3:
La has a sand box in the shape of a right triangle. She is making a cover for the sandbox using plastic. The base of the box is 12ft and the height is 15ft. How much plastic does she need to cover the sand box?
A = (12ft)(15ft) ÷ 2
A = 90ft2

8. Closure
How is finding the area of a right triangle different from finding the area of a triangle that is not right? How is it the same?