In figure, if PQR is the tangent to a ci...

In figure, if PQR is the tangent to a circle at Q whose centre is O, AB is a chord parallel to PR and `angleBQR=70^(@)` then `angleAQB` is equal to

A

`20^(@)`

B

`40^(@)`

C

`35^(@)`

D

`45^(@)`

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The correct Answer is:

B

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