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OpenStudy (anonymous):
A balloon has a circumference of 23 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter.
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OpenStudy (anonymous):
Circumference is 2 pi r Circumference is 23 cm 2pi r =23 r = 23 x 7/44 = 3.659 cm Surface area = 4 pi r sq = 4 x 22/7 x 3.659 x 3.659 = 168.31 Answer : 168 sq cm.
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