Question 751318
Let x = length of each side of a square
area = {{{x^2}}}
perimeter = 4x
{{{x^2 = 77 + 4x}}}
{{{x^2 - 4x - 77 = 0}}}
{{{(x - 11)(x + 7) = 0}}}
x = 11. disregard the negative root
The length of each side is {{{highlight(11)}}}.