7. If the lines 3x – 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to a circle, then the radius of the circle is
(a) 3/2
(b) 3/4
(c) 1/10
(d) 1/20
7. If the lines 3x – 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to a circle, then the radius of the circle is
(a) 3/2
(b) 3/4
(c) 1/10
(d) 1/20