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In a circle with centre O, AOC is a diam...

In a circle with centre O, AOC is a diameter of the circle, BD is a chord and OB and CD are joined. If `angle`AOB `= 130^@`, then `angle`BDC is equal to

A

`30^@`

B

`25^@`

C

`50^@`

D

`60^@`

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The correct Answer is:
B
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