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The difference between the radii of the ...

The difference between the radii of the largest and the smallest circles which have their centre on the circumference of the circle `x^2+y^2+2x+4y-4=0` and pass through the point (a,b) lying outside the given circle,is

A

6

B

`sqrt((a+1)^2+(b+2)^2`

C

3

D

`sqrt((a+1)^2+(b+2)^2)-3`

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PATHFINDER-CIRCLE-QUESTION BANK
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  17. The tangents drawn from the origin x^2+y^2+2gx+2fy+f^2=0 are perpendic...

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  19. If (a,0) is a point on a diameter of the circle x^2+y^2=4, then x^2-4x...

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