A new landowner has a triangular piece of flat land she wishes to fence. Starting at the west corner, she measures the first side to be 80.0 m long and the next to be 105 m. These sides are represented as displacement vectors Asize 12{A} {} from Bsize 12{B} {} inFigure 3.59. She then correctly calculates the length and orientation of the third side Csize 12{C} {}. What is her result?