Question

find the surface area of the sphere whose radius is 21

Answer 1

Here is your answer......

Answer 2

SPHERE:-

radius = r = 21cm

TSA of sphere = 4πr²

                        = 4     22    21      21

                               × ----- ×      ×

                                    7

                         = 4 × 22 × 3 × 21 = 5544

∴The surface area of the sphere = 5544cm².