Question

a metallic pipe is 0.7cm thick.inner radius of the pipe is 3.5cm and length is 5dm.find its total surface area.

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Given ,

Thikness of the pipe = 0.7cm

Inner radius of the pipe (r)= 3.5cm

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

length=5dm or 50cm

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