If the perimeters are equal, you can form an equation to find x: x + x + 12 + x + x + 12 = x + 11 + x + 11 + x + 16 4x + 24 = 3x + 38 - 3x x + 24 = 38 - 24 x = 14 Now you can substitute the x value into the perimeter: (4 × 14) + 24 56 + 24 = 80 cm
(3 × 14) + 38 42 + 38 = 80 cm
So the perimeter would be 80 cm. I hope this helps!
