3 years ago

Need help please.

1 answer:

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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