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P and Q are two points ona circle with c...

P and Q are two points ona circle with centre at O. R is a point on the minor arc of the circle, between the points P and Q. The tangents to the circle at the points P and Q meet each other at the points S. If `anglePSQ =20^@`, then `anglePRQ` =

A

`80^@`

B

`200^@`

C

`160^@`

D

`100^@`

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