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Need help please.
Explain your steps.
If the measure of base angle BAC is 80 degrees, what is the measure of angle ABC? Thanks

Need help please Explain your steps If the measure of base angle BAC is 80 degrees what is the measure of angle ABC Thanks class=

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Stiaen
Hi !

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

The sum of the angles of any triangle is 180°.

[tex]180-80\times2=180-160=20[/tex]

[tex]\boxed{\boxed{\widehat{ABC}=20\°}}[/tex]

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