Question 14. A cylindrical tube needs to be painted on the inside as well as on the outside. It is open on both ends. If the diameter of the tube is 18 cm, and it is 110 cm in length, what is the total surface area of this tube which will be painted?
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Answered by
0
Answer:
Volume of cylinder =πr
2
hcm
2
Outer radius = 16/2=8 cm
Inner radius = 8−2=6 cm
Volume =π(r
′
2
−r
2
)h, where r' = outer radius and r = inner radius
=π×100×(8
2
−6
2
)=8792cm
3
Hence, 8792cm
3
of iron has been used in making the tube.
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Answer:
I too want the answer T-T
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