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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 AD=DC, what is the measure, in degrees, of angle A?

 Apr 8, 2022
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If BD both bisects AC and angle(B), then triangle(ABC) is an isosceles triangle with AB = BC.

Since AB = AC, AB = AC = BC, making the triangle equilateral.

Therefore, angle(A) = 60o.

 Apr 8, 2022

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