如图,DG⊥BC,AC⊥BC,EF⊥AB,∠1=∠2,试判断CD与AB位置关系,作出说明.括号里是填理由.观察分析可知CD⊥AB,理由如下,∵DG⊥BD,AC⊥BC( )∴∠DGB=∠ACB=90°( )∴DG‖AC( )∴∠2=∠DCA( )∵∠1=∠2(
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![如图,DG⊥BC,AC⊥BC,EF⊥AB,∠1=∠2,试判断CD与AB位置关系,作出说明.括号里是填理由.观察分析可知CD⊥AB,理由如下,∵DG⊥BD,AC⊥BC( )∴∠DGB=∠ACB=90°( )∴DG‖AC( )∴∠2=∠DCA( )∵∠1=∠2(](/uploads/image/z/467905-49-5.jpg?t=%E5%A6%82%E5%9B%BE%2CDG%E2%8A%A5BC%2CAC%E2%8A%A5BC%2CEF%E2%8A%A5AB%2C%E2%88%A01%3D%E2%88%A02%2C%E8%AF%95%E5%88%A4%E6%96%ADCD%E4%B8%8EAB%E4%BD%8D%E7%BD%AE%E5%85%B3%E7%B3%BB%2C%E4%BD%9C%E5%87%BA%E8%AF%B4%E6%98%8E.%E6%8B%AC%E5%8F%B7%E9%87%8C%E6%98%AF%E5%A1%AB%E7%90%86%E7%94%B1.%E8%A7%82%E5%AF%9F%E5%88%86%E6%9E%90%E5%8F%AF%E7%9F%A5CD%E2%8A%A5AB%2C%E7%90%86%E7%94%B1%E5%A6%82%E4%B8%8B%2C%E2%88%B5DG%E2%8A%A5BD%2CAC%E2%8A%A5BC%EF%BC%88+%EF%BC%89%E2%88%B4%E2%88%A0DGB%3D%E2%88%A0ACB%3D90%C2%B0%EF%BC%88+%EF%BC%89%E2%88%B4DG%E2%80%96AC%EF%BC%88+%EF%BC%89%E2%88%B4%E2%88%A02%3D%E2%88%A0DCA%EF%BC%88+%EF%BC%89%E2%88%B5%E2%88%A01%3D%E2%88%A02%EF%BC%88)
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