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Perimeter & Circumference A circular swimming pool is 21 feet in diameter. What is the distance around the swimming pool? 1) Determine the shape. 2) Add all sides or use circumference formula. THINGS TO REMEMBER: *To find perimeter, you add ALL side values. *To find circumference, you use the formula C = πD or C = 2πr. Examples: Find the perimeter or circumference of each. a) 12 in b) 3 yd c) 2 in d) 8m 10 cm 6 yd 3 m 12 m 3m 4m 3m e) 4 mm f) 20 in 5 in 5 in 22 in g) The radius of the planet of Jupiter is about 44, 368 miles. What is the approximate circumference of Jupiter to the nearest mile? h) Mr. Marcos, the gym teacher, had the seventh graders run around the perimeter of the gym 3 times. The gym has a length of 34 feet and a width of 50 feet. What was the total distance the students ran? i) A planter full of daisies has a diameter of 14 inches. What is the distance around the planter? j) John is building a dog pen that is 6 feet by 8 feet. How much fencing material will he need to go all the way around the pen? k) Ben is placing rope lights around the edge of a circular patio with a 24.2 ft diameter. The lights are in lengths of 57 inches. How many strands of lights does he need to surround the patio edge? l) John is building a dog pen that is 6 feet by 8 feet. How many feet of fencing material will he need to go all the way around the pen? m) Identify the perimeter of the following triangle below. n) The circular face of a clock has a diameter of 20 centimeters (cm). Which measurement is closest to the circumference of the face of the clock? (Draw a picture to represent the clock.) a. 47.1 cm b. 94.2 cm c. 188.4 cm d. 295.8 cm