Lista de exercícios do ensino médio para impressão

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In the picture below, ABFG and BCDE are squares and their each one sides measures, respectively, a and b. Knowing that $\;\overline{AG}\,=\,\overline{CD}\,+\,2\;\,$ and the perimeter of the triangle ACG is 12, we can assure that a e b are both inside the interval:

a)

]1; 5[

b)

]0; 4[

c)

]2; 6[

d)

]3; 7[

e)

]4; 8[