Equations of two parallel tangents to a circle are $2x-4y-9=0$ and $6x-12y+7=0$. How do I find the radius of the circle?
I have tried many methods, but still I could not find the radius. I know that the distance between two parallel tangents is equal to the diameter, but none of the contact point are given.
If I assume the centre to be $(a,b)$ and radius to be $r$ then when I apply the perpendicular distance of a line from a point I get two equations but I have three unknowns, so I cannot solve....any help will be appreciated