In the above figure, O is the centre of the circle. The angle CBD is equal to
A
25∘
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B
50∘
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C
40∘
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D
130∘
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Solution
The correct option is A25∘ ∵ Angle subtended by Arc ABC at the centre O=50∘ ∴ Angle subtended by Arc ABC at any point on the circumference =25∘ ∴∠ABC=180∘−25∘=155∘ [Since opposite angles of a cyclic quadrilateral are supplementary] ∴∠CBD=180∘−155∘=25∘