Find the surface area of sphere whose diameter is 21dm
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diameter of sphere = d/2
= 21/2 = 10.5
surface area sphere = 4 x 22/7 x r x r
= 4 x 22 /7 x 10.5 x 10.5
= 21/2 = 10.5
surface area sphere = 4 x 22/7 x r x r
= 4 x 22 /7 x 10.5 x 10.5
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