Answers

2016-03-16T00:06:49+05:30
T.S.A = 3 * pie * radius ^2 = 1039.5 . Radius ^2 = 1039.5 * 7 / 22* 3 = 110.25. Radius = root 110.25 = 10.5 cm.Hope it helps and pls mark as the best answer. :-)
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2016-03-16T05:54:24+05:30
TSA of  hemisspere = 3πr²

1039.5     =  3× 22/7 × r²

r²   =  1039.5 × 7  /  3 ×22
      = 110.25

r    = 10.5
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