A phone line runs east along a field of 1 miles and then north along the edge of the same field for 3 miles. If the phone line cost 3500 per mile to install, how much could have been saved if the phone line had been installed diagonally across the field?
per description, this is a right triangle, a triangle with a vertical angle. let L to be the length of diagonal line, so L^2 = 1.8^2 + 2.75^2 =>3.29 so the saving is (1.8+2.75-3.29)*3500=4410
