Question

The radius of a sphere is 3.5 cm . find its surface area​

Answer 1

Answer:

154cm

Step-by-step explanation:

4pi r2 is the formula

Answer 2

Step-by-step explanation:

Lets assume r be the radius of sphere

given r = 3.5 or 7/2 ( for easier calculations )

surface area or TSA of sphere is

$4\pi \: {r}^{2}$

$4 \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2}$

$2 \times 11 \times 7$

$154 \: {cm}^{2}$