AP and BP are tangents to the circle with centre O. Given APB=60° | Calculate ∠AOB, ∠OAB , ∠ACB

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In the given figure, AP and BP are tangents to the circle with centre O. Given APB=60°. Calculate (I)∠AOB (ii)∠OAB (iii)∠ACB
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This same question came in my preboards 0:48

mr.triplet