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In the figure given above, O is the cent...


In the figure given above, O is the centre of a circle circumscribing a quadrilateral `ABCD`. If `AB = BC` and `/_BAC = 40^@`, then what is `/_ADC` equal to ?

A

`50^@`

B

`60^@`

C

`70^@`

D

`80^@`

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