172 Chapter 2 Linear Equations and Inequalities x 17; the measures of the angles are 34° and 56°. y 26.5; the measures of the angles are 28.5° and 61.5°. Perimeter 338 m ft2 67. a. A circle has a radius of r. Write a formula for the circumference. (See Example 6.) b. Solve the formula for the radius, r. c. The circumference of the circular Buckingham Fountain in Chicago is approximately 880 ft. Find the radius. Round to the nearest foot. (3y 18)° 68. a. The length of each side of a square is s. Write a formula for the perimeter of the square. b. Solve the formula for the length of a side, s. c. The Pyramid of Khufu (known as the Great P 4s Pyramid) at Giza has a square base. If the distance around the bottom is 921.6 m, find the length of the sides at the bottom of the pyramid. The length of each side at the bottom of the pyramid is 230.4 m. 65. a. A rectangle has length l and width w. Write a formula for the perimeter. b. Solve the formula for the length, l. c. The perimeter of the soccer field at Giants Stadium is 338 m. If the width is 66 m, find the length. The length is 103 m. 66. a. A triangle has height h and base b. Write a formula for the area. b. Solve the formula for the height, h. c. Find the height of the triangle pictured if the area is 12 km2. l P 2w 2 P 2l 2w A 1 2 bh h 2A b The height is 4 km. 66 m h ? b 6 km C 2pr r C 2p The radius is approximately 140 ft. s P 4 s s s s 61. Find the value of x and the measure of each angle labeled in the figure. 62. Find the value of y and the measure of each angle labeled in the figure. 63. a. A rectangle has length l and width w. Write a formula for the area. b. Solve the formula for the width, w. c. The area of a rectangular volleyball court is 1740.5 and the length is 59 ft. Find the width. The width is 29.5 ft. 64. a. A parallelogram has height h and base b. Write a formula for the area. b. Solve the formula for the base, b. c. Find the base of the parallelogram pictured if the area is 40 m2. (3x 5)° (2x)° 59 ft Area 1740.5 ft2 5 m b ? (y 2)° w A l A lw b A h A bh The base is 8 m. Writing Translating Expression Geometry Scientific Calculator Video
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