1. The problem statement, all variables and given/known data 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 (inside and out, including the ends) is k*PI , what is the value of k? 2. Relevant equations In my view the formula should be: 2* PI * radius * h + 2*PI * radius * radius 3. The attempt at a solution I am confused with the formula. I made the attempt but found the answer wrong because of wrong formula. Some body please guide me. Zulfi.