Answer: 16 metersStep-by-step explanation:Given:Side of the square = 12 metersPerimeter of a square = 4 * sidePerimeter of the square = 4 * 12 = 48 metersSince the perimeter of the equilateral triangle is equal to the perimeter of the square:Perimeter of the equilateral triangle = 48 metersFor an equilateral triangle:Perimeter of an equilateral triangle = 3 * sideGiven that the perimeter of the equilateral triangle is 48 meters:3 * side = 48side = 48 / 3side = 16 metersTherefore, the length of each side of the equilateral triangle is 16 meters.