Question

The surface area of a sphere is 616 cm2

its radius is ………….

A) 7cm
B)14cm
C)21cm
D)28cm​

Answer 1

Answer:

a)7 cm is the radius of 616 cm 2

Answer 2

Step-by-step explanation:

$area \: of \: sphere = 4 \pi {r}^{2}$

$616 = 4 \times \frac{22}{7} \times r$

$616 \times 7 = 4 \times 22 \: \times {r}^{2}$

$r = \frac{4,312}{88}$

${r}^{2} = 49$

$r = 7$

hence option A is correct