Question

A metalic pipe is 0.7 cm thick inner radius of pipe is 3.5 and length is 5 cm find total surface area

Answer 1

Total Surface Area of metallic pipe =242.88 sq. cm.

Answer 2

TSA = 2πRh +2πrh + 2π(R^2 -r^2)= 2πh(R+r) + 2π(R^2 -r^2) = 2πh(4.2+3.5) +2π(4.2^2 -3.5^2)=
10π×7.7 + 2π(17.64-12.25)= 77π + 10.78π= π( 77+10.78) = 22/7 × 87.78 = 275.88 cm^2