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

Mathematics
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  • DLS
yahan par inhone 2r=|P1-P2| kiya hai why did they subtract:/
  • DLS
|dw:1357385377449:dw|

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Other answers:

yeah i remember doing it that way. But I'm not sure why.... lemme think..
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 :(
as @Callisto rightly stated..the lines are parallel, distance between them gives diameter, half of diameter is radius! voila !

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