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Maris
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Asked: 2020-11-16T13:54:21+00:00 In:

Làm dùm mình nha đang cần gấp cảm ơn ạ

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Làm dùm mình nha đang cần gấp cảm ơn ạ
lam-dum-minh-nha-dang-can-gap-cam-on-a

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    2 Answers

    1. Amity

      Amity

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      $\widehat{C_1}=\widehat{B_3}=125^o$ (hai góc so le trong)

      $\widehat{B_4}=180^o-\widehat{B_3}=180^o-125^o=55^o$

      $\widehat{A_1}=\widehat{B_1}=40^o$ (hai góc so le trong)

      $⇒ \widehat{ABC}=\widehat{B_1}+\widehat{B_4}=40^o+55^o=95^o$

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    2. Tryphena

      Tryphena

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      $a//b//c$

      Vì $a//b$

      $→\widehat{A_1}=\widehat{B_1}=40^\circ$ (so le trong)

      Vì $b//c$

      $→\widehat{C_1}+\widehat{B_4}=180^\circ$ (trong cùng phía)

      mà $\widehat{C_1}=125^\circ$

      $→\widehat{B_4}=180^\circ-125^\circ=55^\circ$ 

      Từ hai điều trên $→\widehat{ABC}=40^\circ+55^\circ=95^\circ$

      Vậy $\widehat{ABC}=95^\circ$

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