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

[" 1"" If "2x-4y=9" and "6x-12y+7=0" are parallel tangents to "],[" circle,then radius of the circle is "],[[" (a) "(sqrt(3))/(5)," (b) "(17)/(6sqrt(5))," (c) "(sqrt(2))/(3)," (d) "(17)/(3sqrt(5))]]

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