如图20,BD⊥AC,EF⊥AC,D,F分别为垂足,且∠1=∠4,求证:∠ADG=∠C证明:∵BD⊥AC,EF⊥AC( ) ∴∠2=∠3=90° ∴BD∥EF( ) ∴∠4=_____( ) ∵∠1=∠4( ) ∴∠1=_____( ) ∴DG
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![如图20,BD⊥AC,EF⊥AC,D,F分别为垂足,且∠1=∠4,求证:∠ADG=∠C证明:∵BD⊥AC,EF⊥AC( ) ∴∠2=∠3=90° ∴BD∥EF( ) ∴∠4=_____( ) ∵∠1=∠4( ) ∴∠1=_____( ) ∴DG](/uploads/image/z/11609741-29-1.jpg?t=%E5%A6%82%E5%9B%BE20%2CBD%E2%8A%A5AC%2CEF%E2%8A%A5AC%2CD%2CF%E5%88%86%E5%88%AB%E4%B8%BA%E5%9E%82%E8%B6%B3%2C%E4%B8%94%E2%88%A01%3D%E2%88%A04%2C%E6%B1%82%E8%AF%81%3A%E2%88%A0ADG%3D%E2%88%A0C%E8%AF%81%E6%98%8E%EF%BC%9A%E2%88%B5BD%E2%8A%A5AC%2CEF%E2%8A%A5AC%28+++++%29++%E2%88%B4%E2%88%A02%3D%E2%88%A03%3D90%C2%B0++%E2%88%B4BD%E2%88%A5EF%28++++++++++%29+%E2%88%B4%E2%88%A04%3D_____%28+++++++++++%29++%E2%88%B5%E2%88%A01%3D%E2%88%A04%28++++++++++++++++++%29++%E2%88%B4%E2%88%A01%3D_____%28+++++++++++++%29++%E2%88%B4DG)
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