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Bas_tet [7]
3 years ago
13

Need help please.

Mathematics
1 answer:
Mamont248 [21]3 years ago
4 0
Hi !

BAC is a triangle isocele in B so :  \widehat{BAC}=\widehat{BCA}=80\°\\

<span><em>The sum of the angles of any triangle is 180°.
</em></span>
180-80\times2=180-160=20

\boxed{\boxed{\widehat{ABC}=20\°}}
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