Question:
The surface area of a sphere is 616 cm2 . Find its radius.
Solution:
The surface area of sphere = 616k cm2
We know that
$4 \pi r^{2}=616$
$r^{2}=\frac{616}{4 \pi}$
Taking squire root both the side
$\sqrt{r^{2}}=\sqrt{\frac{616}{4 \pi}}$
$r=7 \mathrm{~cm}$
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