Question

The surface area of a sphere is 616 sq cm. Find its radius. `["Use "pi = 22/7]`

Answer 1

The surface area of the sphere = 616 cm²

Since, the surface area of the sphere = 4πr²

Therefore,

4πr² = 616

4 × `22/7` × r² = 616

r² = 616 × `7/4` × `1/22`

r² = 49

r = `sqrt49`

r = 7 cm

∴ Required radius, r = 7cm