In the picture below, ABFG and BCDE are squares and their each one sides measures, respectively, a and b. Knowing that 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[

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