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If the angle between the circle x^2+y^2-...

If the angle between the circle `x^2+y^2-2x-4y+c=0` and `x^2+y^2-4x-2y+4=0` is `60^@`, then C is equal to

A

`(3pmsqrt5)/2`

B

`(6pmsqrt5)/2`

C

`(9pmsqrt5)/2`

D

`(7pmsqrt5)/2`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH SERIES-SYSTEM OF CIRCLES-Practice Exercise
  1. If radii are 2, sqrt2 and distance between centres is sqrt2 then the a...

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  2. If the angle between the circle x^2+y^2-2x-4y+c=0 and x^2+y^2-4x-2y+4=...

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  3. The angle between the circles x^2+y^2+4x+8y+18=0 and x^2+y^2+2x+6y+8=0...

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  4. If the circles of same radii and with centres (1, 3), (9, 11) cut orth...

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  5. The circles x^2+y^2-6x-8y+12=0, x^2+y^2-4x+6y+k=0 , cut orthogonally t...

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  6. The circle with centre (1, 2) cuts the circle x^2 + y^2 + 14x - 16y + ...

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  7. If the angle between two equal circles with centres (3, 10) (-5, 4) is...

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  8. If a circle through the point (2, 3) cuts x^2 + y^2 = 8 orthogonally t...

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  9. The circle through origin and cutting x^2+y^2-3x-18=0 and x^2+y^2-4y-2...

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  10. The equation of the circle passing through (-1, -1) and cutting the ci...

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  11. The circle passing through the points (2, 3), (0, 0) and intersecting ...

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  12. The point (3, 1) is a point on a circle C with centre (2, 3) and C is ...

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  13. The locus of the centre of the circle cutting the circles x^2+y^2–2x-6...

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  14. Common chord of the circles x^2+y^2-4x-6y+9=0, x^2+y^2-6x-4y+4=0 is

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  15. The common tangent at the point of contact of the two circles x^2+y^2-...

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  16. For the circles 3x^2+3y^2+x+2y-1=0 , 2x^2+2y^2+2x-y-1=0 radical axis i...

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  17. The distance of the point (1, 2) from the common chord of the circles ...

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  18. The intercept made by the radical axis of the circles x^2+y^2+6x-16=0 ...

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  19. The centre of the cirlces cutting three circles x^2+y^2-2x-4y+4=0, x^2...

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  20. B and C are two points on the circle x^2+y^2=a^2 point A (b,c) lies ...

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