Question

A metal pipe has an external diameter of 4 cm
and internal diameter of 3cm and is 20cm long.
Find the volume of the metal used. (Take it =
22/7)​

Answer 1

Answer:

hope this helps....

Explanation:

Given A metal pipe an external diameter of 4 cm and internal diameter of 3 cm

Then metal pipe an external radius of 2 cm and internal radius of 1.5 cm

Then external volume of metal pipe=πr

2

h=π×(2)

2

×20=π×4×20=80π

And internal volume of metal pipe=πr

2

h=π×(1.5)

2

×20=π×2.25×20=45π

Then volume of metal used=80π−45π=35π=35×

7

22

=110cm

3