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PQ is tangent at a point R of the circle...

PQ is tangent at a point R of the circle with centre O. If ST is a diameter of the circle and `angle TRQ = 30^(@)` find `angle PRS`

A

`30^(@)`

B

`60^(@)`

C

`45^(@)`

D

`120^(@)`

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The correct Answer is:
B
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