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In figure , O is the centre of circle then $\; \angle{AOC} \;$ is --

$(a)\;70^{0}C\qquad(b)\;110^{0}C\qquad(c)\;120^{0}C\qquad(d)\;140^{0}C$

Answer : $\;140^{0}C$
O is the centre of circle then $\; \angle{AOC} \;$ is $\;140^{0}C$