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A regular octagon is inscribed inside a square. If the perimeter of the square is 400, then what is the perimeter of the regular octagon?
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A.100( $$\sqrt{2}$$ - 1)
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B.400( $$\sqrt{2}$$ - 1)
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C.600( $$\sqrt{2}$$ - 1)
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D.800( $$\sqrt{2}$$ - 1)
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E.1000( $$\sqrt{2}$$ - 1)
D显示答案