Find the circumcentre and circumradius of the triangle whose vertices are (1, 1), (2, -1), and (3, 2).

a) Circumcentre: (2, 0), Circumradius: √5
b) Circumcentre: (2, 1), Circumradius: √5
c) Circumcentre: (1, 1), Circumradius: 2
d) Circumcentre: (3, 1), Circumradius: 3