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altura= x
P= 2(3x+x) = 2(4x) = 8x
PLANTEO DE LA ECUACION
P=80
8x = 80
x =80/8
x=10
base =3x = 3*10
base = 30 m
P=80cm
P=b+b+a+a
b=x
a=3x
OPERACIÓN
P=3x+3x+x+x
80=3x+3x+x+x
80=8x
80:8=10
x=10
base = 10
altura =30 (10*3=30)
RESPUESTA
Base = 10cm