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PA and PB are the tangents to a circle with centre O, from a point P outside the circle. A and B are the points on the circle. If `angle APB= 72^@`,then `angle OAB` is equal to:
PA तथा PB एक वृत्त पर वृत्त के बाहर स्थित बिंदु P से खींची गयी स्पर्श रेखाएं हैं जिसका केंद्र O है | A तथा B वृत्त पर स्थित बिंदु हैं | यदि `angle APB= 72^@` है, तो `angle OAB` का मान ज्ञात करें |

A

`72^@`

B

`24^@`

C

`18^@`

D

`36^@`

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