If the surface area of a sphere is 1386 cm2, then find the radius of the sphere.

12.5 cm 10.5 cm 10 cm 12 cm

10.5 cm

We know that, Surface area of sphere = 4πr2 Given, Surface area of sphere = 1,386 cm2 = 1,386 cm2 = 4 × \(\frac{22}{7}\) × r2  = (1,386 × 7) × \(\frac{1}{4 × 22}\) = r2 = (63 × 7) × \(\frac{1}{4}\) = r2 =  \(\frac{441}{4}\) = r2 r = \(\frac{21}{2}\) r = 10.5 cm