1. The problem statement, all variables and given/known data I have a wire in the shape of a truncated cone. One side has radius a and the other has radius b. The wire has resistivity ρ and length L. I am supposed to find the resistance of the wire using R = ρL/A 2. Relevant equations R= ρL/A 3. The attempt at a solution So far I have set up my integeral. I know the answer, but I am having trouble with the actual integration by substitution. ρ∫ dx / (π * (a + (b - a)(x / L))^2) u = a + (b - a)(x / L) du = ( b - a ) / L This just gets me into a huge mess. The answer is ρL/ab. Thanks for any help.