If the length of the cone and radius of the cone are 12 cm and x cm respectively. The difference between the curved surface area of the cone and the total surface area of the cone is 616 cm². If the side of the equilateral triangle is (x - 12) cm more than the radius of the cone, then find the perimeter of the equilateral triangle.
1
73
2
64
3
48
4
72
5
76