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The vertices of triangle PQR lie on a ci...

The vertices of `triangle PQR` lie on a circle with centre O. SR is a tangent to the circle at the point R. If QR bisects the `angle ORS`, then what is the measure of `angle RPQ` ?
त्रिभुज PQR के शीर्ष बिंदु एक वृत्त पर अवस्थित हैं जिसका केंद्र O है| SR बिंदु R पर वृत्त की स्पर्श रेखा है | यदि QR, `angle ORS` को द्विभाजित करता है, तो कोण RPQ का माप ज्ञात करें |

A

`60^@`

B

`45^@`

C

`40^@`

D

`30^@`

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