Question 815228
x and y.  Side lengths for the rectangle shape.


{{{xy=575}}}, and {{{2x+y=p}}} for perimeter.  This uses y as the side parallel to the cliff.


p is a function of x and y.
{{{y=575/x}}} so substitute:
{{{p=2x+575/x}}}---------Now, p is expressed as just a function of x.


You could try graphing this with some software and look for the x value at which p is the smallest value.  You might also try taking the derivative of p versus x, set this equal to zero, and find the value for x.  You should find something near x=16.5, not sure exactly the value  (I used google search for the function and found an interactive graph.)