Question
Find the radius of the sphere whose surface area is equal to its volume .
✓
Answer
Surface area $=$ volume
$\Rightarrow 4 \pi r^2=\frac{4}{3} \pi r^3$
$\Rightarrow 3 r^2=r^3 $
$\Rightarrow r =3$
Radius of the sphere $=3$ units
$\Rightarrow 4 \pi r^2=\frac{4}{3} \pi r^3$
$\Rightarrow 3 r^2=r^3 $
$\Rightarrow r =3$
Radius of the sphere $=3$ units
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