If PA and PB are two tangents to a circle with centre O such that $\angle\ APB= 80^{0} then, \angle\ AOP=$

If PA and PB are two tangents to a circle with centre O such that $\angle\ APB= 80^{0} then, \angle\ AOP=$
1). $40^{0}$
2). $50^{0}$
3). $60^{0}$
4). $70^{0}$

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