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2016-04-11T17:28:22+05:30

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Total surface area of sphere = 4πr²
98.56 cm² = 4πr²
r² = 7.84
r = 2.8 cm
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2016-04-11T17:28:35+05:30

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TSA = 4πr² = 98.56 cm²
 
 r² = 98.56 × 7÷ 22 × 4 = 7.84cm ⇒ r = 2.8 cm
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