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Q.

The surface area of a sphere is[[1]] cm2, whose diameter is 21 cm.


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Detailed Solution

The surface area of a sphere is 1386cm2, whose diameter is 21 cm.
It is given, diameter=21cm.
We know that,
Radius= Diameter 2 Radius= 21 2 cm The surface area of a sphere =4π r 2 .
Substituting the values,
=4× 22 7 × 21 2 × 21 2 =1386  cm 2
The surface area is 1386c m 2 .
Therefore, the final answer is 1386cm2.
 
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