Question 118356
let 2k="length of fence", y="length of enclosure", x="width of enclosure"


perimeter=2x+2y ___ 2k=2x+2y ___ k=x+y ___ k-y=x


area=x*y ___ a=(k-y)y ___ a=ky-y^2


the maximum area is at the axis of symmetry ___ y=-k/(2(-1)) ___ y=k/2


x+y=k ___ x+(k/2)=k ___ x=k/2


x=y ___ width=length ___ definition of square