Question

Calculate the surface area of a sphere of radius $2.8$ cm.

• A. $98.56$ cm${}^2$
• B. $68.56$ cm${}^2$
• C. $38.56$ cm${}^2$
• D. None of these

Answer 1

The correct option is A $98.56$ cm${}^2$

Given, radius $r=2.8$ cm.

We know that, the surface area of a sphere of radius $r$ $=4\pi r^2$

$=4\times \frac{22}{7}\times 2.8\times 2.8$

$=98.56{cm}^2$.

Therefore, option $A$ is correct.