x + x+4 + x +x+4=40
4x+8=40
4x=32
x=8
el largo es 4+x ... entonces remplazamos 4+8=12
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x + x+4 + x +x+4=40
4x+8=40
4x=32
x=8
el largo es 4+x ... entonces remplazamos 4+8=12
perímetro = 2(a + l )
a : ancho = X
L : largo = X + 4
Reemplazamos datos
2(X+X+4) = 40
2(2X+4) = 40
2X + 4 = 20
2X = 16
X = 8
NOS PIDE
Largo = 12 cm