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A regular octagon $\mathrm{ABCDEFGH}$ has sides of length $6$ $\mathrm{cm}$ each. Then the area, in $\mathrm{sq. cm}$, of the square $\mathrm{ACEG}$ is

  1. $36(1+\sqrt{2})$
  2. $72(2+\sqrt{2})$
  3. $72(1+\sqrt{2})$
  4. $36(2+\sqrt{2})$

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