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Segment QR of length r is a tangent at Q...

Segment QR of length r is a tangent at Q to a circle of radius r with centre at P. What is the area of the part of the triangle PQR, which is outside the circular region ?

A

`(pi r^(2))/(16)`

B

`(r^(2))/(2) - (pi r^(2))/(8)`

C

`(r^(2))/(2) - (pi r^(2))/(16)`

D

`(r^(2))/(4) - (pi r^(2))/(8)`

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