If the radius of a coin is 20 cm, find its surface area.
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Answer:
If r = 20 cm then the area of each side is 400 pi sq cm. Since a coin has 2 sides, the total surface area is 800 pi sq cm.
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If r = 20 cm then the area of each side is 400 pi sq cm. Since a coin has 2 sides, the total surface area is 800 pi sq cm.
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