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2x15:1x15 -> 30:15 = P --> 30x2+12x2= 60+24= 84 (no cumple)
2x20: 1x20 -> 40:20= P --> 40x2+20x2= 80+40= 120 (si cumple)
Entonces ya tenemos los lados
Perimetro= 120cm
Largo=40cm
Ancho= 20cm
A= a*b
A= 40cm*20cm
A= 80cm^2
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