The birthday cake was about to be served . you were told you could have 0.6, 60% 3/5 , 6% which 3 will give you the same portion

How do you solve a question like this?

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Use the given information to determine the exact trigonometric value.