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