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a= (x+6)(x+12)
a= x^2+12x+6x+72
a=x^2+18x+72
perímetro = suma de todos los lados
p= 2(x+6)+2(x+12)
p= 2x+12+2x+24
p= 4x+36
SUERTE
Altura : x+12
Base : x+6
=> Area=Base * Altura
A= (x+6)(x+12)
A=x^2+6x+12x+72
A= x^2+18x+72
=> Perímetro : 2.(Base + Altura)
P= 2(x+6 + x+12)
P= 2(2x+18)
P=4x+36