Question

The surface area of metallic sphere is 616 cm find its radius

Answer 1

here is ur answer:

surface area of sphere = 4π r^2

$616 = 4\pi {r}^{2} \\ \\ 616 = 4 \times \frac{22}{7} \times {r}^{2} \\ \\ \frac{616 \times 7}{4 \times 22} = {r}^{2} \\ \\ \frac{28 \times 7}{4} = {r}^{2} \\ \\ \frac{196}{4} = {r}^{2} \\ \\ \sqrt{ \frac{196}{4} } = r \\ \\ \frac{14}{2} = r \\ \\ r = 7$

radius = 7cm

hope it helps you!