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If the circles x^(2) + y^(2) = a^(2) and...

If the circles `x^(2) + y^(2) = a^(2) and x^(2) + y^(2) - 6x - 8y + 9 = 0` touches each other externally, then a = …….

A

1

B

-1

C

21

D

16

Text Solution

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The correct Answer is:
A
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KUMAR PRAKASHAN-CONIC SECTIONS-TEXTBOOK BASED MCQS
  1. Coordinates of the centre of the circle given by the equation lambda x...

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  2. If the circle x^(2) + y^(2) + 2gx + 2fy + c = 0 does not intersects th...

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  3. If the circles x^(2) + y^(2) = a^(2) and x^(2) + y^(2) - 6x - 8y + 9 =...

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  4. ……..of the following is the equation of circle passes from (-1,-2) and...

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  5. Point (2, k) is the exterior point of the circles x^(2) + y^(2) + x - ...

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  6. AA t in R, …….is the point lies on parabola x^(2) = 4ay.

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  7. Vertex of the parabola (y - 2)^(2) = 16 (x - 1) is ……..

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  8. Line 2x - 3y + 8 = 0 intersects parabola y^(2) = 8x of points P and Q ...

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  9. Line y = mx + 3 is tangent to parabola 3y^(2) = 2x then m = ……..

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  10. The area of the region bounded by the parabola y^2 =4ax and its ...

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  11. Find the equation of a line parallel to X- axis and passing through th...

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  12. M is the foot of perpendicular from point P of the parabola y^(2) = 4...

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  13. Equation of parabola with focus (-3, 0) and directrix x + 5 = 0 is …….

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  14. Focus and directrix of parabola x^(2) = - 8ay are …….., …….. Respectiv...

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  15. Line l : 2x - 3y + 8 = 0 intersect parabola y^(2) = 8x in point P and...

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  16. Eccentricity of ellipe 9x^(2) + 25y^(2) = 225 is …….

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  17. If for an ellipse length of minor axis and distance between two focii ...

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  18. Length of latus rectum of ellipse 2x^(2)+81y^(2)=162

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  19. Length of latus rectum of ellipse 4x^2+9y^2=1 is ............ .

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  20. Eccentricity of ellipse is ..........if length of latus rectum is half...

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