Find the surface area of a sphere of diameter :
$21 c m$

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Solution

Diameter of sphere = 21cm
radius of sphere = $\frac{21}{2} = 10.5 c m .$
surface area of sphere = $4 π r^{2}$
$= 4 \times 3.14 \times (10.5)^{2}$
surface area of sphere = 1384.74. $c m^{2}$

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