If \( 2 x-4 y=9 \) and \( 6 x-12 y+7=0 \) are parallel tangents to circle, then radius of the ci...

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If \( 2 x-4 y=9 \) and \( 6 x-12 y+7=0 \) are parallel tangents to circle, then radius of the circle, is
(A) \( \frac{\sqrt{3}}{5} \)
(B) \( \frac{17}{6 \sqrt{5}} \)
(C) \( \frac{\sqrt{2}}{3} \)
(D) \( \frac{17}{3 \sqrt{5}} \)
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