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P=2(50+20)
P= 140 metros
En hectometros 1.40 Hm
perimetro = 2(b+a)
perimetro = 2(50 m + 20 m)
Perimetro = 2(70 m)
perimetro = 140 m
pero 1 hm = 100m
entonces
la respuesta es la a