Question

Find the volume of metal used in making a l m pipe of external radius 3 cm and width 0.5 cm.​

Answer 1

Answer:

Step-by-step explanation:

Given that the external and internal radius of pipe is 4 cm and 3 cm and length is 10 cm

Then External volume of pipe =πr  

2

h=2π(4)  

2

×10=π×16×10=160π sq cm

Or internal volume of pipe =πr  

2

h=2π(3)  

2

×10=π×19×10=90π sq cm

Then volume of metal pipe=160π−90π=70π=70×  

7

22

​  

=220cm  

2