.in a cyclic quadrilateral abcd ∠bcd=120° and passes through the centre of the circle. then ∠abd = ?
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Given :∠ BCD= 120°
∠ ADB= 90° ( angle in the semi circle)
∠BCD+∠BAD= 180° ( opposite angles in a cyclic quadrilateral is supplementary)
____________________________
∠ABD= 30°
_____________________________
Hope this will help you...
∠ ADB= 90° ( angle in the semi circle)
∠BCD+∠BAD= 180° ( opposite angles in a cyclic quadrilateral is supplementary)
____________________________
∠ABD= 30°
_____________________________
Hope this will help you...
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