Draw the perpendicular bisector of one side of the triangle
Draw the perpendicular bisector of a second side of the triangle
Find the point where the two perpendicular bisectors intersect
That intersection point is the circumcentre of the triangle
Draw the perpendicular bisector of one side of the triangle
Draw the perpendicular bisector of a second side of the triangle
Find the point where the two perpendicular bisectors intersect
That intersection point is the circumcentre of the triangle