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[수학 정보] 삼각형의 외각의 이등분선 정리 새로운방법?
하주민 2020.05.14 00:03 조회 1308
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

이 정리가 중2 과정이라 엇각, 동위각 이런거만 활용해서 증명방법을 알려주더라고요.

어쩌다 중1에 나오는 합동으로 새로운 방법을 알아낸 것 같은데 수학잘하시는 분들 확인 부탁드립니닷.

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  •  
    베네딕트0724 Lv.6 2020.05.14 21:55

    댓글 작성하기 좋아요1 댓글수0
  •  
    222 Lv.9 2020.05.16 06:59

    그런데 저 중간에 내각의 이등분선정리가 포함돼 있는데 거기서 중2 과정이 나오지 않나요? (아닌가?)

    댓글 작성하기 좋아요1 댓글수1
    •  
      하주민 Lv.2 2020.05.19 18:25

      엇!! 맞네요.......... 죄송합니닷........정작 핵심은 중2과정을 써놨네.......ㅋㅋㅋㅋ

      좋아요0
  •  
    그래프홀릭 Lv.3 2020.05.19 09:35

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    조금 늦게 이 글을 봤네요! 이 조건에서는 합동으로 충분히 이 외각 이등분선 정리도 증명할 수 있어요! 저로서는 왠만한 도형 공식, 정리의 증명의 열쇠가 삼각형의 닮음, 합동에 있다고 보거든요~ 마지막줄의 '\Delta ACE에서'를 추가하고 'AE:BE = AC:BC'라고 오타를 정정하시면 증명 과정을 더 쉽게 이해할 수 있을 것 같아요! 외각의 이등분선과 선분 BC=DC가 같다는 두 조건에 의하여 합동임을 보이고, 그 합동에서 같은 요소와 내각의 이등분선을 알아내었으니 \Delta ABC의 외각의 이등분선 정리가 성립함을 보일 수가 있어요!

    댓글 작성하기 좋아요0 댓글수1
    •  
      하주민 Lv.2 2020.05.19 18:27

      바로 수정합니닷!!! 친절한 설명 고맙습니다!!!!

      좋아요0

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