This looks like a homework exercise!
You need to remember several things:
1. Distance formula
2. How to find the midpoint/gradients of perpendicular lines
3. How to find where lines intersect
4. Think about how you might find the centre, and the radius. This is all you need
5. Draw a diagram perhaps. Shortest distances tend to be perpendicular
6. Find the intersections. Distance formula.
These should all be in your notes.
Good luck! Post back if you're struggling