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Perimetro (p) = 42cm
Ancho = x
Largo = x + 10
Formula.
Perimetro(p) = 2 * Largo + 2 * Ancho
42 = 2(x + 10) + 2 *x
42 = 2x + 20 + 2x
42 = 4x + 20
42 - 20 = 4x
22 = 4x
22/4 = x
5 ,5 = x
El ancho = x = 5, 5cm
Largo = x + 10 = 5,5 + 10 = 15,5cm
Respuesta.
El rectángulo tiene de largo 15,5cm y de ancho 5,5cm