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If a circle of radius r is touching the...

If a circle of radius `r` is touching the lines `x^2-4x y+y^2=0` in the first quadrant at points `Aa n dB` , then the area of triangle `O A B(O` being the origin) is (a)`3sqrt(3)(r^2)/4` (b) `(sqrt(3)r^2)/4` (c)`(3r^2)/4` (d) `r^2`

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