Question

find the surface area of a sphere of diameter 21 CM​

Answer 1

Answer:

surface area of sphere =50904 cm²

Answer 2

Diameter=21cm

Radius=d/2=21/2

Area of sphere = 4×22/7×r^2

=4×22/7×21/2×21/2

=22×21×3

=1386cm^2