If the lines $3x - 4y + 4 = 0$ and $6x - 8y - 7 = 0$ are tangents to a circle, then the radius of the circle is
If the lines $3x - 4y + 4 = 0$ and $6x - 8y - 7 = 0$ are tangents to a circle, then the radius of the circle is
- [IIT 1984]
- A
$3\over2$
- B
$3\over4$
- C
$1\over10$
- D
$1\over20$
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