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Question
In the given figure, ABC is an equilateral triangle. Angle ADC is:
Options
60°
100°
80°
120°
MCQ
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Solution
120°
Explanation:
Since, ABC is an equilateral triangle.
∴ ∠ABC = 60°
We know that,
The opposite angles of a cyclic quadrilateral are supplementary.
∴ ∠ABC + ∠ADC = 180°
⇒ 60° + ∠ADC = 180°
⇒ ∠ADC = 180° − 60° = 120°
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