circumference is looooooooong

Find the ecuation of the circumference:
A(3,2) and B(-1,3) are points of the circumference, and it's centre belongs to the line r: 3x-y-2=0

How do I solve this problem?
Also long circumference is looooooooong

Thanks, but I didn't get one thing.
How do I make equation for perpendicular bisector?