Question

A metallic pipe is 0.7cm thick. ineer radius of the pipe is 3.5 cm and length is 5 dm. find its total surfae area​

Answer 1

Answer:

Thickness of the pipe = 0.7cm

Inner radius of the pipe (r )= 3.5cm

External radius of the pipe (R ) = (3.5+ 0.7 )cmor,4.2cm

length=5 dm or 50 cm

We know,

total surface area of pipe = 2π (r+ R ) ( h+ R - r)

Total surface area of pipe= 2×22/7(3.5+4.2)(50+4.2-3.5)

= 44/7 × 7.7 × 50.7

=2453.88cm^2

So the answer should be 2453.88cm^2

HOPE THIS HELPS YOU! :)

Answer 2

Answer:

8.5 cm is a correct answer .

Step-by-step explanation:

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