Question

3. A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm,
the outer diameter being 4.4 cm Find its
(i) inner curved surface area
3
² outer curved surface area
3 . total surface area ​

Answer 1

Answer:

Given, outer diameter of the pipe =4.5cm and inner diameter =4cm

Therefore, outer radius (R) of the pipe =2.25cm and inner radius (r)=2cm

Given, length or height of the cylinder =77cm

So, volume of the cylinder =π(R

2

−r

2

)h=

7

22

×(2.25

2

−2

2

)77=257.125cm

3

Now, weight of the pipe = volume X density =257.125×8g=2057g =2.057kg

Answer 2

Answer:

1064.8 CM

Step-by-step explanation:

please mark as brainlist