Question 1120518
Sides are x and 8-x, to make a half perimeter of 8.  2x+16-2x=16
Maximize the product of those 2
x(8-x)=-x^2+8x
Using calculus, first derivative is -2x+8=0 or 2x=8 and x=4, a square 4 x 4 with area 16
Or, parabola with vertex x value at -b/2a which occurs at -8/-2 or 4, and the same result.