Answer:[tex]a = \frac{p}{3} = \frac{12}{3} = 4cm[/tex]Step-by-step explanation:Determine the side of an equilateral triangle whose perimeter is equal to a square of side 12 cm.So if the perimeter is equal to the square of side 12 cm, we can set up an equation:3s = 12^23s = 144s = 48 cmI hope it Helps you:DPaki Like/Rate nlng po:D