Question

The radius of a cylinder is 21cm and height
is 10cm then CSA of Cylinder will be​

Answer 1

Step-by-step explanation:

Correct option is

C

21 cm

Let the height of cone be 'h', then 

πr2H=31πr2h=4400㎤

⇒πr2[21−3h]=4400⇒63−h=22×10×103×4400×7=42

⇒h=63−42=21㎝