Question

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

Answer 1

The surface area of sphere = 616cm²

Since, the surface area of sphere = 4πr²

Therefore,

\(4\pi r^2 = 616\)

\(4\times\frac{22}{7}\times r^2= 616\)

\(r^2=616\times\frac74\times\frac1{22}\)

r² = 49

r = 7 cm

∴ Required radius, r = 7cm