如图,在平行四边形ABCD中,AB⊥AC,AB=1,BC=2倍根号5.对角线AC,BD相交于点O,将直线AC绕点O顺时针旋转,分别交于BC,AD于点E,F.(1)证明:当旋转角90°时,四边形ABEF是平行四边形,(2)试证明在旋转过程
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![如图,在平行四边形ABCD中,AB⊥AC,AB=1,BC=2倍根号5.对角线AC,BD相交于点O,将直线AC绕点O顺时针旋转,分别交于BC,AD于点E,F.(1)证明:当旋转角90°时,四边形ABEF是平行四边形,(2)试证明在旋转过程](/uploads/image/z/2724053-5-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAB%E2%8A%A5AC%2CAB%3D1%2CBC%3D2%E5%80%8D%E6%A0%B9%E5%8F%B75.%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E5%B0%86%E7%9B%B4%E7%BA%BFAC%E7%BB%95%E7%82%B9O%E9%A1%BA%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%2C%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8EBC%2CAD%E4%BA%8E%E7%82%B9E%2CF.%EF%BC%881%EF%BC%89%E8%AF%81%E6%98%8E%EF%BC%9A%E5%BD%93%E6%97%8B%E8%BD%AC%E8%A7%9290%C2%B0%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABEF%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%2C%EF%BC%882%EF%BC%89%E8%AF%95%E8%AF%81%E6%98%8E%E5%9C%A8%E6%97%8B%E8%BD%AC%E8%BF%87%E7%A8%8B)
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