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El ancho = 4m
Fórmula del perímetro es :
2 * L + 2 * A
Resolvemos :
2 (3m) + 2 (4m) = 56
6m + 8m = 56
14m = 56
m = 56/14
m = 4
3m = 3 (4) = 12
4m = 4 (4) = 16
Solución :
El largo es = 12 cm
El ancho es = 16 cm
Largo = 3x
Ancho = 4x
Perimetro = 2 * Largo + 2 * Ancho
56cm = 2(3x) + 2(4x)
56 cm = 6x + 8x
56cm = 14x
56cm/14 = x
4cm = x
Largo = 3x = 3 * 4cm = 12cm
Ancho = 4x = 4 * 4cm = 16cm
Respuesta.
Las dimensiones del rectangulo son 12cm de largo y 16cm de ancho