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Two touch lines drawn from a point P out...

Two touch lines drawn from a point P outside of a circle with center O are PA and PB. A and B is the point on the circle. If `angle APB=70`, then what is the value of `angle OAB` ?
केंद्र O वाले एक वृत्त के बाहर किसी बिंदु P से खींची गयी दो स्पर्श रेखाएं PA और PB है | A और B वृत्त पर बिंदु है | यदि `angle APB=70`, तो `angle OAB` का मान क्या है ?

A

`20^@`

B

`35^@`

C

`25^@`

D

`50^@`

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