Question

The area of the curved surface of a sphere is $5544m^2$. Find the radius of the sphere.

• A. $12$ m
• B. $20$ m
• C. $22$ m
• D. $21$ m

Answer 1

The correct option is D $21$ m

Given, area of curved surface of a sphere $=5544$ $c{m}^2$

We know, curved surface area of sphere $=4\pi r^2$

$\Rightarrow 5544=4\times \frac{22}{7}\times r^2$

$\Rightarrow 7\times 5544=4\times 22\times r^2$

$\Rightarrow r^2=441$

$\Rightarrow r=21m$.

Therefore, option $D$ is correct.