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In triangle ABC, AB=AC and D is a point on line AC so that line BD bisects angle ABC. If BD=BC, what is the measure, in degrees, of angle A?

(Be careful with this one.) smiley

 Jan 5, 2021
 #1
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https://web2.0calc.com/questions/geometry-help_68

 Jan 5, 2021
 #2
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The answer from the above link is incorrect!!!

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In triangle ABC, AB=AC and D is a point on line AC so that line BD bisects angle ABC. If BD=BC, what is the measure, in degrees, of angle A?

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AB = AC        BD = BC          AD = BD = BC  

 

The sum of the interior angles of each triangle is 5x

 

 5x = 180        x = 36          ∠A = 36º

 

jugoslav  Jan 5, 2021
edited by jugoslav  Jan 6, 2021

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