Question

If the surface area of sphere is 616cm2 , find its radius..

Answer 1

surface area = 4π r² = 616
⇒π r² = 154
⇒r² =(154×7)/22 =49
⇒r = 7 cm

Answer 2

Surface area of sphere = 4πr²
∴ 616 = (4*22*r²)/(7)
=> r² = 616*7/88 = 7*7
=> r = √(7*7) = 7 cm