如图所示,在三角形ABC中,∠BAC=90°,E是BC上一点,连EA,做∠AEC、∠AEB的角平分线分别交AC、AB于F、D.若EF⊥AC.(1)证明∠B=∠FEC(2)以内错角相等加以判断AC与DE平行吗?为什么?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 09:23:53
![如图所示,在三角形ABC中,∠BAC=90°,E是BC上一点,连EA,做∠AEC、∠AEB的角平分线分别交AC、AB于F、D.若EF⊥AC.(1)证明∠B=∠FEC(2)以内错角相等加以判断AC与DE平行吗?为什么?](/uploads/image/z/14916858-42-8.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E2%88%A0BAC%3D90%C2%B0%2CE%E6%98%AFBC%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%BF%9EEA%2C%E5%81%9A%E2%88%A0AEC%E3%80%81%E2%88%A0AEB%E7%9A%84%E8%A7%92%E5%B9%B3%E5%88%86%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4AC%E3%80%81AB%E4%BA%8EF%E3%80%81D.%E8%8B%A5EF%E2%8A%A5AC.%EF%BC%881%EF%BC%89%E8%AF%81%E6%98%8E%E2%88%A0B%3D%E2%88%A0FEC%EF%BC%882%EF%BC%89%E4%BB%A5%E5%86%85%E9%94%99%E8%A7%92%E7%9B%B8%E7%AD%89%E5%8A%A0%E4%BB%A5%E5%88%A4%E6%96%ADAC%E4%B8%8EDE%E5%B9%B3%E8%A1%8C%E5%90%97%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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