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If 2 x-4 y=9 and 6 x-12 y+7=0 are common...

If `2 x-4 y=9` and `6 x-12 y+7=0` are common tangtnts to a circle, then radius of the circle is

A

1

B

2

C

4

D

6

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The correct Answer is:
A
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HIMALAYA PUBLICATION-CIRCLES-QUESTION BANK
  1. The radius of the larger circle lying in the first quadrant and touch...

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  2. The equation of the circle of radius 5 and touching the coordinate ax...

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  3. If 2 x-4 y=9 and 6 x-12 y+7=0 are common tangtnts to a circle, then r...

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  4. If P is a point such that the ratio of the squares of the ltngths of t...

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  5. If the circle x^(2)+y^(2)+6 x-2 y+k=0 bisects the circumference of th...

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  6. A line l meet the circle x^(2)+y^(2)=61 in A and B and P(-5,6) is suc...

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  7. If the line 3 x-2 y+6=0 meets x -axis and y -axis respectively at A an...

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  8. If P(1), P(2) and P(3) are the perimeters of the three circleS and ...

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  9. The number of circleS that touch all the three lines x+y-1=0, x-y-1=0...

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  10. Which of the following equations gives a circle

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  11. The equation of the circle described on the common chord of the circ...

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  12. If y=3 x is a tangent to a circle with centre (1,1) then the other ta...

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  13. If x-y+1=0 meets the circle. x^(2)+y^(2)+y-1=0 at A and B, then t...

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  14. The ltngth of the tangtnt drawn to the circle x^(2)+y^(2)-2 x+4 y-11=...

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  15. Observe the following statements I. The circle x^(2)+y^(2)-6 x-4 y-7=...

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  16. The number of common tangents to the circles x^(2) + y^(2) = 4 and x^(...

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  17. The equation of the circle having its centre on the line x +2y - 3 = 0...

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  18. The circleS x^(2)+y^(2)+2 a x+c^2=0 and x^(2)+y^(2)+2 b y+c^2=0 touch...

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  19. To which of the following circleS, the line y-x+3=0 is a normal at (3...

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  20. The equation of the circle which touches both the axes and the line 4...

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