Ai giải mình mấy câu này với ạ!Thanks

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Ai giải mình mấy câu này với ạ!Thanks

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    Giải thích các bước giải:

    a.Xét $\Delta AMN, \Delta ABC$ có:

    Chung $\hat A$

    $\hat M=\hat B$ vì $MN//BC$

    $\to \Delta AMN\sim\Delta ABC(g.g)$

    b.Xét $\Delta AMN, \Delta A’B’C’$ có:

    $\widehat{MAN}=\widehat{B’A’C’}$

    $\widehat{AMN}=\hat B=\hat B’$

    $\to \Delta AMN\sim\Delta A’B’C'(g.g)$

    c.Ta có: $\Delta ABC\sim\Delta AMN, \Delta AMN\sim\Delta A’B’C’$

    $\to \Delta ABC\sim\Delta A’B’C’$

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