Finding the Area of Right Triangles

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Presentation transcript:

Finding the Area of Right Triangles TeacherTwins©2015

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

Finding the Area of Right Triangles

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

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

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

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

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?