1. The problem statement, all variables and given/known data Find the Resistance between terminals B-C, B-D 2. Relevant equations 3. The attempt at a solution The book says that the 2 80-ohm resistors are in parallel for terminals A-B, and the answer for B-C=90ohms, B-D=85ohms. I don't quite understand why this is. Is it because the 2 80ohm resistors are in series between terminals B-C and B-D, and therefore it short circuits because the other path (wire only) is 0 ohms? Does this mean that whether the resistors are in series or parallel depends on the path taken?