There you have 15 meters converted to centimeters. But I doubt that there's a swimming pool anywhere that's 15 meters deep at either end.
15 meters is a smidgen more than 49 feet. That's like eight 6-ft people all standing on shoulders to reach from the bottom to the surface. It's dangerous, and it's a huge expense for heating and chlorine tablets, for so much water in which hardly anybody will ever go halfway to the bottom.
Longitud = L Ancho = A 2A + 2L = 54 L = 2A Sustituir este valor por L en la primera ecuación: 2A + 2(2A) = 54 2A + 4A = 54 6A = 54 A = 9 También porque L = 2A, L = 2(9) = 18