To find the amount needed to build the fence you would first need to find the perimeter of the rectangle. Which the formula is P=2(l+w).
Then you plug in your numbers into the formula and you’ll get P=2(90.66+45.5)
Then you can do the math or type it into a calculator and you’ll get 272.32................Then just leave the numbers after the decimal out and 272 should be your estimated answer