If the lines `3x-4y+4=0` and `6x-8y-7=0` are tangents to a circle, then find the radius of the circle.

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

If lines 3x - 4y + 4 = 0 " and " 6x - 8y - 7 = 0 touch the same circle , then its radius is

Centre of a circle of radius 4sqrt(5) lies on the line y=x and satisfies the inequality 3x+6y > 10. If the line x+2y=3 is a tangent to the circle, then the equation of the circle is

The line 2x-y+1=0 is tangent to the circle at the point (2,5) and the centre of the circles lies on x-2y=4 The radius of the circle is: