9. Surface area of sphere is 616cm. Find it's radius.
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Answer:
Step-by-step explanation:
Surface area of sphere = 4πr²
4 x 22/7 x r² = 616
88/7 x r² = 616
r² = 616 x 7/88
r² = 7 x 7
r² = 49cm
r = 7cm
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