The triangle and square shown below have the same perimeter . what is the length of one side of the square

If "x" = 1 then triangle perimeter = 12 and square perimeter = 12

So, one side of the square = (x +2) = (1 + 2) = 3

Step-by-step explanation:

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11