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(2009•潍坊)如图,已知Rt△ABC中,∠ABC=90°,∠BAC=30°,...
(2009•潍坊)如图,已知Rt△ABC中,∠ABC=90°,∠BAC=30°,AB=2
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cm,将△ABC绕顶点C顺时针旋转至△A′B′C′的位置,且A、C、B′三点在同一条直线上,则点A经过的最短路线的长度是( )cm.
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A.8
B.4
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C.
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π
D.
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π
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