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largo= 3x
a= 1200m²
a= ancho xlargo
1200m²= x(3x)
1200= 3x²
3x²= 1200
x²= 1200/3
x²= 400
x= √400
x= 20 ancho
3x= 3(20) = 60 largo
comprobacion
1200= 20x60
1200= 1200