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If a circle has two of its diameters alo...

If a circle has two of its diameters along the lines `x+y=5` and `x-y=1` and has area `9 pi` , then the equation of the circle is

A

`x^(2)+y^(2)-6x-4y+4=0`

B

`x^(2)+y^(2)-6x-4y-3=0`

C

`x^(2)+y^(2)-6x-4y-4=0`

D

`x^(2)+y^(2)-6x-4y+3=0`

Text Solution

Verified by Experts

The correct Answer is:
A
Two diameters `x+y=5` and `x-y=1` intersect at (3, 2) which is the centre of the circle. Let r be the radius of the circle. Then,
Area `=9 pi rArr pi r^(2)= 9 pi rArr r = 3`.
So, the equation of the circle is
`(x-3)^(2)+(y-2)^(2)=3^(2)` or, `x^(2)+y^(2)-6x-4y+4=0`.
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OBJECTIVE RD SHARMA-CIRCLES-Chapter Test
  1. If a circle has two of its diameters along the lines x+y=5 and x-y=1 a...

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  2. The two circles x^2 + y^2 -2x+6y+6=0 and x^2 + y^2 - 5x + 6y + 15 = 0 ...

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  3. The two circles x^(2)+y^(2)-2x-2y-7=0 and 3(x^(2)+y^(2))-8x+29y=0

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  4. The centre of the circle passing through (0, 0) and (1, 0) and touchin...

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  5. The circle x^2+y^2=4 cuts the circle x^2+y^2+2x+3y-5=0 in A and B, The...

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  6. One of the limit point of the coaxial system of circles containing x^(...

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  7. A circle touches y-axis at (0, 2) and has an intercept of 4 units on t...

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  8. The equation of the circle whose one diameter is PQ, where the ordinat...

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  9. The circle x^2 + y^2+ 4x-7y + 12 = 0 cuts an intercept on y-axis equal...

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  10. Prove that the equation of any tangent to the circle x^2+y^2-2x+4y-4=0...

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  11. The angle between the pair of tangents from the point (1, 1/2) to the...

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  12. The intercept on line y = x by circle x^2 + y^2- 2x = 0 is AB. Find eq...

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  13. If 3x+y=0 is a tangent to a circle whose center is (2,-1) , then find ...

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  14. Locus of the middle points of chords of the circle x^2 + y^2 = 16 whic...

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  15. Two tangents to the circle x^2 +y^2=4 at the points A and B meet at P(...

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  16. A tangent is drawn to the circle 2(x^(2)+y^(2))-3x+4y=0 and it touch...

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  17. the length of the chord of the circle x^(2)+y^(2)=25 passing through ...

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  18. If the points A(2, 5) and B are symmetrical about the tangent to the c...

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  19. The equation of the circle of radius 2sqrt(2) whose centre lies on the...

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  20. Prove that the maximum number of points with rational coordinates on a...

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  21. The equation of a circle C is x^(2)+y^(2)-6x-8y-11=0. The number of re...

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