如图所示,在等腰Rt△ABC中,P是斜边BC的中点,以P为顶点的直角的两边分别与边AB,AC交于点E,F,连接EF.当∠EPF绕顶点P旋转时(点E不与A,B重合),若PE=a,求EF的长
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![如图所示,在等腰Rt△ABC中,P是斜边BC的中点,以P为顶点的直角的两边分别与边AB,AC交于点E,F,连接EF.当∠EPF绕顶点P旋转时(点E不与A,B重合),若PE=a,求EF的长](/uploads/image/z/2616285-21-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E7%AD%89%E8%85%B0Rt%E2%96%B3ABC%E4%B8%AD%2CP%E6%98%AF%E6%96%9C%E8%BE%B9BC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E4%BB%A5P%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E7%9B%B4%E8%A7%92%E7%9A%84%E4%B8%A4%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%8E%E8%BE%B9AB%2CAC%E4%BA%A4%E4%BA%8E%E7%82%B9E%2CF%2C%E8%BF%9E%E6%8E%A5EF%EF%BC%8E%E5%BD%93%E2%88%A0EPF%E7%BB%95%E9%A1%B6%E7%82%B9P%E6%97%8B%E8%BD%AC%E6%97%B6%EF%BC%88%E7%82%B9E%E4%B8%8D%E4%B8%8EA%2CB%E9%87%8D%E5%90%88%EF%BC%89%2C%E8%8B%A5PE%3Da%2C%E6%B1%82EF%E7%9A%84%E9%95%BF)
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