如图8中图①,两个等边△ABD,△CBD的边长均为1,将△ABD沿AC方向向

如图8中图①,两个等边△ABD,△CBD的边长均为1,将△ABD沿AC方向向
右平移到△ABD的位置得到图②,则阴影部分的周长为_________

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