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 T =
22/7)​

Answer 1

Answer:

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

Step-by-step explanation: