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If the lines $3x+4y-14=0$ and $6x+8y+7=0$ are both tangents to a circle, then its radius is
\[\begin {array} {1 1} (a)\;7 & \quad (b)\;\frac{7}{2} \\ (c)\;\frac{7}{4} & \quad (d)\;\frac{7}{6} \end {array}\]
jeemain
eamcet
math
2011
q69
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Sep 23, 2013
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meena.p
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$(c)\;\frac{7}{4}$
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Nov 7, 2013
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pady_1
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