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O is the centre of the circle. A tangent is drawn which touches the circle of C. If `angle AOC =80^@`,then what is the value (in degrees) of `angle BCX`?
O वृत्त का केन्द्र है। एक स्पर्श रेखा बनाई गई है जो वृत्त को C पर स्पर्श करती है। यदि `angle AOC =80^@`है, तो `angle BCX` का मान (डिग्री में) क्या होगा?

A

80

B

30

C

40

D

50

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