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The triangle PQR is inscribed in the cir...

The triangle PQR is inscribed in the circle `x^2+y^2 = 25`. If Q and R have co-ordinates(3,4) and(-4, 3) respectively, then `angle QPR` is equal to

A

`pi/2`

B

`pi/3`

C

`pi/4`

D

`pi/6`

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