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Two tangents PA and PB are drawn to a circle with centre O from an external point P. If `angle OAB= 30^@`, then `angle APB` is:
केंद्र O वाले वृत्त पर एक बाहरी बिंदु P से दो स्पर्श रेखाएँ PA तथा PB खींची जाती हैं | यदि `angle OAB= 30^@` है, तो `angle APB` का मान क्या होगा ?

A

`120^@`

B

`60^@`

C

`30^@`

D

`15^@`

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