Triangle ABC is an isosceles triangle with AB = AC. If angle BAC = 50°, then the degree measure of angle ABC is equal to:
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 65°.
In an isosceles triangle ABC with AB = AC, the base angles ∠ABC and ∠ACB are equal.
Given ∠BAC = 50°,
Sum of angles in a triangle = 180°
So, ∠ABC + ∠ACB = 180° − 50° = 130°
Since ∠ABC = ∠ACB = x,
2x = 130° → x = 65°