1. 9.2 Perimeter and Area of Triangles and Trapezoids Objective: Students find the perimeter and area of triangles and trapezoids.

2. Using Perimeter O Find the missing measurement when the perimeter is 92 cm. 48 cm 14 cm 20 cmd P = 48 + 14 + 20 + d 92 = 82 + d - 82 10 = d d = 10 cm

3. Multi-Step Application Step 1: Find the length of the third side. Step 2: Find the perimeter of the field. O A farmer wants to fence a field that is in the shape of a right triangle. He knows that the two shorter sides of the field are 20 yards and 35 yards long. O How long will the fence be to the nearest hundredth of a yard? P = a + b + c 20 yds 35 yds P = 20 + 35 + 40.31 P = 95.31 The fence will be about 95.31 yards long.

4. Triangles and Trapezoids = + =+ h b h +

5. Area Area of Triangles and Trapezoids WordsFormulaNumbers Triangle: The area A of a triangle is one-half of the base length b times the height h. 4 8 7 2 3

6. Finding the Area of Triangles and Trapezoids O Graph and find the area of each figure with the given vertices. A. (-2, 2), (6,2), (3,7)

7. Finding the Area of Triangles and Trapezoids O Graph and find the area of each figure with the given vertices. A. (3,0), (-1,0), (-1,2), (1,2)