Garden max area is if the sides are as equal as possible so he should try to make a square (ideal is a circle, but barn walls are normally straight) squaer perimiter=4 times legnth of 1 side perimiter=amount of fencing=80 80=4s divide 4 20=s one sides=20
area=legnth times width in squaer, legnth=width
20=legnth 20=width area=20 times 20=400
dimetions are 20ft by 20ft to give 400ft^2 (fun fact, if it were a circle, the area would be about 509.5ft^2)
