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Given a circle of radius r. Tangents are...

Given a circle of radius `r`. Tangents are drawn from point `A and B` lying on one of its diameters which meet at a point `P` lying on another diameter perpendicular to the other diameter. The minimum area of the triangle `PAB` is : (A) `r^2` (B) `2r^2` (C) `pir^2` (D) `r^2/2`

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