Perimeter: The perimeter of the triangle is the distance around the triangle, so add the lengths of the sides: P 5 in. 5 in. 8 in. 18 in. b) Area: The formula for the area of a rectangle is A lw. Identify the length and width: l 2 m, w 3 4 m. Use the formula A lw. A lw A (2 m) a 3 4 mb Substitute the values for l and w. A 3 2 m2 Multiply. We can write the answer as an improper fraction or mixed number. The area of the rectangle is 3 2 m2 or 1 1 2 m2. Perimeter: The perimeter of the rectangle is the distance around the rectangle, so add the lengths of the sides or use the formula P 2l 2w. P 2l 2w P 2(2 m) 2 a 3 4 mb Substitute the values for l and w. P 4 m 3 2 m Multiply. P 8 2 m 3 2 m Get a common denominator. P 11 2 m Add. The perimeter of the rectangle is 11 2 m or 5 1 2 m. YOU TRY 1 Find the area and perimeter of each fi gure. a) ft 3 5 ft 3 5 b) 11 cm 10 cm 8 cm 10 cm 23 cm The volume of a three-dimensional object is a measure of the amount of space occupied by the object or the amount of space inside the object. Volume is measured in cubic units like cubic feet (ft3) or cubic centimeters (cm3). Make a chart of the volume formulas we have learned. www.mhhe.com/messersmith Putting It All Together 327
messersmith_power_prealgebra_1e_ch4_7_10
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