If S 4pi n 2 find (I) the value of S when r 10 1 2 (ii) the positive value of r when S 616 22 (Take to be) 7

Question

If S   4pi   n   2 find (I) the value of S when r   10 1 2 (ii) the positive value of r when S 616  22 (Take to be) 7

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Question: If S = 4pi * n ^ 2 find (I) the value of S when r = 10 1/2 (ii) the positive value of r