11.
如图,在△ABC中,∠A=120°,AB=AC=6,点D在AB上,过点D作DE∥BC交AC于点E,现将△ADE沿着DE所在的直线折叠,使得点A落在点A′处,A′D,A′E分别交BC于点F、G.若FG:DE=1:2,则图中阴影部分的周长为( )
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| A. | 3$\sqrt{3}$+6 | B. | 4$\sqrt{3}$+8 | C. | 6$\sqrt{3}$+4 | D. | 8$\sqrt{3}$ |