Find the perimeter of the rectangle. 14 cm 9 cm 9 cm 14 cm Solution We can fi nd the perimeter by adding the lengths of the sides: P 14 cm 9 cm 14 cm 9 cm 46 cm. Or, we can use the formula. Identify the length, l, and the width, w. Then, use the formula P 2l 2w. l 14 cm, w 9 cm P 2l 2w P 2(14 cm) 2(9 cm) Substitute the values for l and w. P 28 cm 18 cm Multiply. P 46 cm Add. The perimeter of the rectangle is 46 cm. EXAMPLE 1 YOU TRY 1 Find the perimeter of the rectangle. 5 mm 21 mm What is the area of a fi gure? Definition The area of a fi gure is the size of the region enclosed in the fi gure. For example, if we have a rug that is 8 ft long and 5 ft wide, the amount of surface that it covers is the area of the rug. 8 ft 5 ft 1 ft 1 ft Area 40 square feet or Area 40 ft2 www.mhhe.com/messersmith SECTION 4.2 Rectangles, Squares, Parallelograms, and Trapezoids 295
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