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If O is a circumcentre of DeltaABC and O...

If O is a circumcentre of `DeltaABC` and `OD_|_BC` the find `angleBOD`?

A

`angleA`

B

`(1)/(2)angleA`

C

`(1)/(2)angleB`

D

`(1)/(2)angleC`

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