If you have 40 feet of fencing to put around a garden what are the dimensions of the largest rectangular garden you can enclose?

10' X 10' = 100 sqft. The more you deviate from a square, the smaller the area will be. If you change the sides by 1 foot, you are left with 9 X 11 which is only 99 sqft. If you make the rectangle long and narrow, 19 X 1 is only 19 sqft.