If the area of the quadrilateral by the ...

If the area of the quadrilateral by the tangents from the origin to the circle `x^2+y^2+6x-10 y+c=0` and the radii corresponding to the points of contact is `15 ,` then the value of `c` is (a) 9 (b) 4 (c) 5 (d) 25

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