A jar top is shaped like a circle. The circumference of the top is 20pie centimeters. Which measurement is closest to the area of the top square centimeters. A. 31.4 cm2

B. 62.8 cm2

C. 314 cm2

D. 1,256 cm2

ExerciseProblemSolution

1The diameter of a nickel is 2 cm. What is the circumference?d = 2 cm; C = 3.14 (2 cm); C = 6.28 cm

2The circumference of a bicycle wheel is 50.24 in. What is the diameter?C = 50.24 in; d = 50.24 in ÷ 3.14; C = 16 in

3The radius of a circular rug is 4 ft. What is the circumference?r = 4 ft; d = 8 ft; C = 3.14 (8 ft); C = 25.12 ft

4The circumference of a compact disc is 28.26 centimeters. What is the radius?C = 28.26 cm; d = 28.26 cm ÷ 3.14; d= 9 cm; r = 4.5 cm

5The diameter of your bicycle wheel is 25 in. How far will you move in one turn of your wheel?d = 25 in; C = 25 in (3.14); C = 78.5 in

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the expected value of the random variable : 0, 1 and 2

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