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Question
AM = MB, ∠AOB = 140°
∠OAB =
Options
40°
30°
20°
35°
MCQ
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Solution
20°
Explanation:
In isosceles triangle OAB (radii OA = OB), the vertex angle at O is 140°.
So each base angle
∠OAB = ∠OBA
= `(180^circ - 140^circ)/2`
= 20°
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