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PA and PB are two tangents from a point P outside the circle with centre O. If A and B are points on the circle such that `angle APB = 100^@`, then `angle OAB` is equal to :
PA और PB, केंद्र O वाले वृत्त के बाहर एक बिंदु P से, दो स्पर्शरेखा हैं। यदि A और B वृत्त पर ऐसे बिंदु हैं जैसे `angle APB = 100^@`, तो ∠`angle OAB` का मान ज्ञात करे |

A

`70^@`

B

`35^@`

C

`45^@`

D

`50^@`

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