Question

Select the closest answer. *

Answer 1

Answer:

D. 221.7 cm

Step-by-step explanation:

Surface area of a sphere is: $SA=4\pi r^2$

'r' - radius

We are given the radius of 4.2 centimetres.

$SA=4\pi 4.2^2\\4 * \pi * 4.2^2\\\rightarrow 4.2^2 =17.64\\\text {Using 3.14 for pi: }\\4 * 3.14 *17.64\\12.56*17.64\\\boxed {221.5584}$

221.5584 ≈ 221.6

The closest answer is Option D, therefore it should be the correct answer.