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Equation of circle with centre (-a,-b) a...

Equation of circle with centre (-a,-b) and radius `sqrt(a^(2)-b^(2))` is

A

`x ^(2) + y ^(2) + 2ax + 2 by + 2b ^(2) =0`

B

`x ^(2) + y ^(2)-2ax -2by -2v ^(2) =0`

C

`x ^(2) + y^(2) - 2ax -2by + 2b ^(2) =0`

D

`x ^(2) + y^(2) -2ax + 2by + 2a ^(2) =0`

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The correct Answer is:
A
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TARGET PUBLICATION-CIRCLE AND CONICS -COMPETITIVE THINKING
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  2. The equation x^(2)+y^(2)+4x+6y+13=0 represents

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  3. Equation of circle with centre (-a,-b) and radius sqrt(a^(2)-b^(2)) is

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  4. If the equation (K(x+1)^(2))/(3) + ((y + 2 )^(2))/(4) =1 represents a ...

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  5. x ^(2) + y^(2) + (2K -1) xy -2x + 4y + 3=0 represents the equation of ...

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  6. x ^(2) + hxy + y^(2) -6x -2y +k=0 is the equation of the circle and 2...

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  7. A circle x ^(2) + y^(2) + 2gx + 2fy + c=0 passing through(4,-2) is co...

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  8. Find the centre and radius of the circles2x^2+2y^2-x=0

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  9. If one end of a diameter of the circle x^(2) + y^(2) -4x-6y +11=0 is (...

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  10. The point diametrically opposite to the point P(1, 0) on the circle x^...

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  11. If the line x+2b y+7=0 is a diameter of the circle x^2+y^2-6x+2y=0 , t...

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  12. If one of the diameters of the curve ""^(2) + y ^(2) - 4x - 6y +9=0 is...

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  13. If one of the diameters of the circle, given by the equation x ^(2) + ...

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  14. Find the equation of a circle of radius 5 which lies within the circle...

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  15. The equation of the circle which passes through the points of intersec...

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  16. The intercept on the line y=x by the circel x ^(2) + y^(2) -2x =0 is ...

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  17. Let the line segment joining the centres of the circles x^(2)-2x+y^(2)...

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  18. If the lengths of the tangents drawn from P to the circles x ^(2) + y ...

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  19. IF the tangent at (1,7) to the curve x ^(2) = y-6 touches the circle ...

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  20. Find the centre of the circle that passes through the point (1,0) and ...

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