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Trường Sơn Nguyễn

07/08/2017 at 13:05
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Tam giác ABC có tia phân giác của góc B cắt AC ở D. Qua A kẻ đường thẳng song song với BD, đường thẳng này cắt đường thẳng BC ở E. Hãy chứng tỏ rằng 




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    Kayasari Ryuunosuke Coordinator 07/08/2017 at 13:30

    A B C D E

    Because : BD // AE

    => \(\widehat{DBA}=\widehat{BAE}\)  (2 Alternate interior angles)

    In another face , we got : \(\widehat{DBA}=\widehat{BEA}\) (2 Corresponding angles)

    So \(\widehat{BAE}=\widehat{BEA}\)

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    Lê Quốc Trần Anh Coordinator 07/08/2017 at 13:25

    You could go to this source for Vietnamese question: https://olm.vn/


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