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A metallic pipe is 0.7. cm thick. Inner radius of the pipe is 3.5 cm and length is5 dm. Find its total surface area.Hint: Total surface area = Inner surface area + Outer surface area + Area of two rims​

Answer»

Answer:

Step-by-step EXPLANATION:

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=5dm or,50cm

We KNOW,

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

or, 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


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