1. The problem statement, all variables and given/known data A transmission line is made of aluminum wire 1 inch in diameter. What is the resistance of 20 miles of this wire? 2. Relevant equations Resistance varies directly with the length of a wire and inversely with its cross-sectional area. Resistivity of aluminum = 2.8 x 10-8 R=pl/A Where l=32,186.88 meters Find cross-sectional area. R= 2.8 x 10-8 (31,186.88)/A = 3. The attempt at a solution I'm stuck trying to find the cross-sectional area, A. Also, the answer has to be in the same units as the problem, so does that mean I have to convert to inches and miles? The answer should be in ohms correct?