Question

Calculate the surface area of a sphere with radius $3.2cm$.

• A. $110.65c{m}^2$
• B. $128.61c{m}^2$
• C. $131.54c{m}^2$
• D. None of these

Answer 1

The correct option is B $128.61c{m}^2$

Given, radius of the sphere, $r=3.2cm$.

Therefore, the surface area of sphere $=4\pi r^2$

$=4\pi (3.2{)}^{2}c{m}^2$

$=4\times 3.14\times 3.2\times 3.2c{m}^2$

$=128.61c{m}^2$.

Hence, option $B$ is correct.