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[창의 퍼즐] [기하] 수심삼각형
△π 2020.08.16 17:00 조회 614
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

(1)예각삼각형 ABC의 각 꼭짓점에서 대변에 내린 수선의 발을 D,E,F라 할 때, 삼각형 DEF를 수심삼각형이라 하자. 삼각형 ABC의 각 변의 길이를 a,b,c, 각 각의 크기를 A,B,C라 하자. DEF의 둘레를 abcABC를 이용해 나타내어라.

(2)DEF의 각 변의 길이를 abcABC를 이용해 2가지 이상의 방법으로 나타내어라.(단, A에서 내린 수선의 발이 D, B에서 내린 수선의 발이 E, C에서 내린 수선의 발이 F이다.)

(3)DEF의 넓이를 abcABC를 이용해 나타내어라(물론 2번에서 제2코사인 쓸 수 있겠지만 정말*\infty 비추합니다.)

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  •  
    전자기역학 Lv.8 2020.08.16 18:47

    Too hard

    댓글 작성하기 좋아요0 댓글수3
    •  
      △π Lv.9 2020.08.16 22:39

      아니ㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ

      좋아요0
    •  
      대한미국남자 Lv.6 2020.08.17 13:34

      ㅋㅋㅋ 이 투표는 어디서 할 수 있나요?

      좋아요0
    •  
      전자기역학 Lv.8 2020.08.17 20:27

      폴리매스 카페입니다!

      좋아요0
  •  
    유클리드 Lv.6 2020.08.19 09:31 비밀댓글
    확인요청중

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    •  
      △π Lv.9 2020.08.20 04:37 비밀댓글
      비밀 댓글이 등록 되었습니다!
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