Question

find the surface and volume of sphare whose diameteris 21 cm

Answer 1

Answer:

Given, diameter of the sphere, d=21cm.

Then, radius of sphere =r= diameter/2

21/2=10.5cm.

Therefore, surface area of sphere

=4πr²

=4× 22/7 ×10.5×10.5

=1386cm²

Hence, the required surface area is 1386cm²