The diagonal of a square is 14 m, what is the perimeter

The diagonal of a square is obtained by using Pythagorean theorem. Letting x be the side of the square, 
                                       x² + x² = 14²
Solving x from the equation gives x a value of approximately 9.899 m. The perimeter of a square is four times the length of its side. Thus, the perimeter of the square is approximately 39.60 meters. 

If your asking how much altogether for 12 performance the answer will be 98,496.