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A cyclic quadrailatral ABCD is such that...

A cyclic quadrailatral ABCD is such that AB=BC, AD=Dc `AC _|_ BD, angle CAD = theta` Then the angle `angle ABC`

A

`theta`

B

`(theta)/(2)`

C

`(2 theta)`

D

`3 theta`

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The correct Answer is:
C
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