Question

A 5 foot-long cylindrical pipe has an inner diameter of 6 feet and an outer diameter of 8 feet.
If the total surface area is kn(n=Pi) ,what is the value of k ?

Answer 1

\[Area=2\pi*(8/2)*5 + 2\pi*(6/2)*5 + 2* [ \pi(8/2)^{2}-\pi(6/2)^{2}]\]
\[Area=\pi[2*(8/2)*5 + 2*(6/2)*5 + 2* [ (8/2)^{2}-(6/2)^{2}]\]
\[k=[2*(8/2)*5 + 2*(6/2)*5 + 2* [ (8/2)^{2}-(6/2)^{2}]\]
\[k=[2*(4)*5 + 2*(3)*5 + 2* [ (4)^{2}-(3)^{2}]\]

Answer 2

Thank you ^^