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Altura = x
Base = 3x
Perimetro = 80cm
Perimetro = 2 * Base + 2 * Altura
Perimetro = 2( Base + Altura)
80cm = 2 ( 3x + x)
80cm/2 = 4x
40cm = 4x
40cm /4 = x
10cm = x
La altura = x = 10cm
La base = 3x = 3 * 10cm = 30cm
Las dimensiones del nuevo rectangulo
Altura = 2x= 2 * 10cm = 20cm
Base = 2(3x) = 6x = 6 * 10cm = 60cm
Respuesta.
La medidas del nuevo rectangulo son base = 60cm y altura = 20cm