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If the circle x^2+y^2+2gx+2fy+c=0 is tou...

If the circle `x^2+y^2+2gx+2fy+c=0` is touched by `y=x` at `P` such that `O P=6sqrt(2),` then the value of `c` is 36 (b) 144 (c) 72 (d) none of these

A

36

B

144

C

72

D

none of these

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The correct Answer is:
C
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OBJECTIVE RD SHARMA-CIRCLES-Exercise
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  5. The length of the common chord of the circles x^(2)+y^(2)-2x-1=0 and ...

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  6. If a circle passes through the point (a, b) and cuts the circle x^2 + ...

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  9. One of the diameter of a circle circumscribing the rectangle ABCD is 4...

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  11. If (mi,1/mi),i=1,2,3,4 are concyclic points then the value of m1m2m3m4...

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  12. Find the area of the triangle formed by the tangents from the point (4...

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  13. The tangent at P, any point on the circle x^2 +y^2 =4 , meets the coor...

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  14. The equation of the circle which touches the axes of coordinates and ...

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  15. If the chord of contact of the tangents from a point on the circle x^2...

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  16. If from the origin a chord is drawn to the circle x^(2)+y^(2)-2x=0, t...

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  17. The locus represented by x=a/2(t+1/t), y=a/2(t-1/t) is

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  18. If the circle C1: x^2 + y^2 = 16 intersects another circle C2 of radiu...

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  19. Find the locus of the midpoint of the chord of the circle x^2+y^2-2x-2...

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