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DLS

  • one year ago

If 2x-4y-9=0 & 6x-12y+7=0 are tangents to same circle then R=?

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  1. DLS
    • one year ago
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    @ParthKohli @rajathsbhat

  2. DLS
    • one year ago
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    yahan par inhone 2r=|P1-P2| kiya hai why did they subtract:/

  3. DLS
    • one year ago
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    |dw:1357385377449:dw|

  4. rajathsbhat
    • one year ago
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    yeah i remember doing it that way. But I'm not sure why.... lemme think..

  5. Callisto
    • one year ago
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    Hmm.. Not sure if this way works! 2x-4y-9=0 & 6x-12y+7=0 = tangents to the same circle. That have the same slope => perpendicular distance between the two lines is the diameter of the circle. Half of the diameter is the radius :\ I think this is not a smart way to solve your problem though :(

  6. shubhamsrg
    • one year ago
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    as @Callisto rightly stated..the lines are parallel, distance between them gives diameter, half of diameter is radius! voila !

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