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80= (2x+8)*(2x+2)/2
160=4x^2 +4x+16x+16
160= 4x^2+20x+16
160-16=4x^2+20x
simplificando
36=x^2 +5x
x=4
hallaremos a, b,c
c= raiz cuadrada de a^2 + b^2
a= 2(4)+8= 16
b= 2(4)+2= 10
perimetro = a+b+ raiz de a^2+b^2
perimetro= 16+10 +raiz de (16)^2 + (10)^2