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Base = X
Hallemos el valor de la base
Perimetro = 2B + 2A
104 = 2(X) + 2(X-12) Sustituimos los valores
2X + 2X - 24 = 104
4X = 104 + 24
X = 128/4
X = 32 cm
Altura = 32 cm - 12 cm = 20 cm --> Respuesta
Base = 32 cm --> Respuesta
Saludos desde Venezuela
altura = 12 cm
b= x
Entonces: 104=X+12
104=X
X= 104-12
X= 92