Question

The volume of a cylinder closed at one end is 1056cm³. If it's height is 21cm ,

find it's
(I) diameter​

Answer 1

8cm

Explanation:

volume = πr²h

1056 = 22/7 (π) ×r²× 21

1056=66r²

r²= 16

r= 4

but diameter = 2r

D= 2×4

=8