Answers

2016-04-10T11:38:36+05:30
4π(r+2)² = 4πr² + 352

4π( r² + 4 + 4r ) = 4πr²
4πr² + 8π + 8πr = 4πr² + 352
8πr = 352 - 8π
8πr = 326.87
r =  13
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