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PA and PB are two tangents to a circle w...

PA and PB are two tangents to a circle with centre O, from a point P outside the circle A and B are points on the circle. If `angle APB=86^@`, then `angle OAB` is equal to:
PA तथा PB केंद्र O वाले वृत के बाहर स्थित बिंदु P से वृत्त पर खींची गयी दो स्पर्श रेखाएं हैं | A और B वृत्त पर स्थित बिंदु हैं | यदि `angle APB=86^@` है, तो `angle OAB` का ज्ञात करें |

A

a)`43^@`

B

b)`45^@`

C

c)`50^@`

D

d)`20^@`

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