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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= 110^@`, then `angle OAB` is equal to:
PA तथा PB केंद्र O वाले वृत्त के बाहर स्थित बिंदु P से निकली स्पर्श रेखाएं हैं | यदि A और B वृत्त पर स्थित ऐसे बिंदु हैं कि `angle APB= 110^@` है, तो `angle OAB` किसके बराबर है ?

A

`45^@`

B

`55^@`

C

`70^@`

D

`35^@`

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