The curved surface area of a hemisphere is 693 cm2. What is the volume of the hemisphere

Dont dlt...

Given, curved surface area of a hemisphere is 693 cm2. 
Let r be the radius of the hemisphere. 
So,Curved surface area of a hemisphere=2πr2
⇒693=2×227×r2
⇒r2=110.25
⇒r=10.5 cm
Now,Volume of hemisphere=23πr3                                      
=23×227×(10.5)3                                      
=2425.5 cm3
Hence, volume of hemisphere is 2425.5 cm3

it's 22/7 not 227
regards