In the figure, O is the centre of the circle. ∠AOC= 100° , ∠BAO= 40° ,∠OAD= 30° .Then
find the following angles.( Hint : ABCD is a cyclic quadrilateral. Opposite angles of the cyclic
quadrilateral are supplementary .Also the angle on the alternate arc is half the central angle
of the arc. *
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