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AB and CD are the diameters of a circle ...

AB and CD are the diameters of a circle which intersect at P. Join AC, CB, BD and DA. If `anglePAD = 60^(@)`, then what is `angleBPD` equal to?

A

`30^(@)`

B

`60^(@)`

C

`90^(@)`

D

`120^(@)`

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