Hello Friends,
Kindly help to solve:
O B C and D are the vertices of a rhombus & A B C and D lie on the circle with centre O. Find angles - BOC, OBC, BAC, BDC

Thanks a lot for reply. Actually it was my first post and there was small mistake in writing the problem too.
But fortunately I got the solution myself after banging the head again and again

I will post some other problem if need be. Thanks again