Question

a cylinder is made of metal having thickness is 2cm. the outer diametre of the cylinder is 14 cm and height is also 14cm. so find the volume of cylinder and also volume of metal used?

Answer 1

vol of cylinder= 1/4 × π(D²-d²)h
put the value n get answer.

vol of metal used = vol of cylinder

Answer 2

External Diameter = 14
External Radius = 14/2 =7
Thickness = 2
so inner radius = 7-2 =5
volume of a cylinder = 22/7 (R^2-r^2 )h
=22/7 ( 7^2-5^2) × 14
=22×2(49-25)
=44(24)
=1056cm^2