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XR is a tangent to the circle. O is the ...

XR is a tangent to the circle. O is the centre of the circle. If `angle XRP=120^@`, then what is the value (in degrees) of `angle QOR`?
XR वृत्त पर एक स्पर्श रेखा है O वृत्त का केन्द्र है। यदि `angle XRP=120^@` है, तो `angle QOR` का मान (डिग्री में) क्या है?

A

80

B

70

C

60

D

40

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