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A cyclic Quadrilateral ABCD is such that...

A cyclic Quadrilateral ABCD is such that AB=BC, AD=DC and AC and BD intersect at O. If `angle CAD= 46^@`, then the measure of `angle AOB` is equal to:
एक चक्रीय चतुर्भुज ABCD इस प्रकार है की AB = BC, AD = DC और AC और BD पर O पर प्रतिच्छेदित करती है । यदि `angle CAD= 46^@` है, तो `angle AOB` का माप है:

A

`84^@`

B

`86^@`

C

`90^@`

D

`80^@`

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