Question

a metallic pipe is 0.7 CM thick inner radius of pipe is 3.5 cm and length is 5 decimeter find the total surface area

Answer 1

Given,

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