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The tangents are drawn at the extremitie...

The tangents are drawn at the extremities of diameter AB of a circle with centre P. If a tangent to the circle at the point C intersects the other two tangents at Q and R, thenthe measure of the `angleQPR` is___

A

`45^@`

B

`60^@`

C

`90^@`

D

`180^@`

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