1. EXAMPLE 1 Finding the Area of a Parallelogram SOLUTION A = bh Write formula for area. = 8 10 Substitute 8 for b and 10 for h. = 80 Multiply. ANSWER The parallelogram has an area of 80 square inches. Find the area of the parallelogram.

2. EXAMPLE 2 Finding the Area of a Trapezoid SOLUTION Architecture The Winslow House in River Forest, Illinois, was designed by Frank Lloyd Wright. The front part of the roof is a trapezoid, as shown. What is its area? Write formula for area of a trapezoid. Substitute values for b 1, b 2 and h. Multiply. A = (b 1 + b 2 )h 1 2 1 2 A = (31 + 77)25 = 1350 ANSWER The front of the roof has an area of 1350 square feet.

3. GUIDED PRACTICE for Examples 1 and 2 Sketch the quadrilateral and find its area. A = bh Write formula for area. = 20 9 Substitute 20 for b and 9 for h. = 180 Multiply. ANSWER The parallelogram has an area of 180 m 2. 1. A parallelogram with a base of 20 meters and a height of 9 meters

4. GUIDED PRACTICE for Examples 1 and 2 Substitute values for b 1, b 2 and h. Multiply. A = (b 1 + b 2 )h 1 2 1 2 A = (14 + 17)6 = 93 Write formula for area of a trapezoid. The trapezoid has an area of 93 square feet. ANSWER 2. A trapezoid with bases of 14 feet and 17 feet and a height of 6 feet