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[" (3) If O is the centre of a circle of...

[" (3) If O is the centre of a circle of radius "r" and "AB" is a chord of the circle at a distance "r/2],[" from "O" ,then "/_BAO=],[[" (a) "," (d) "0," (c) "30^(@)," (d) "15^(@)]]

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