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Perimetro ractangulo = 19cm
Largo = 4cm
Ancho = x
Perimetro del rectangulo = 2 * Ancho + 2 * Largo
19 = 2x + 2 * 4
19 = 2x + 8
19 - 8 = 2x
11 = 2x
11/2 = x
5,5 = x
Ancho = x = 5,5
Respuesta.
El ancho mide 5,5cm y el largo 4cm