Perpendicular Bisector
1. Create a circle with center at A and goes through B.
2. Create a circle with center at B and goes through A.
3. Create point C as the intersection above the segment.
4. Create point D as the intersection below the segment.
5. Create line CD.
6. Create point E as the intersection of segment AB and line CD.
Line CD bisects segment AB.
Line CD is perpendicular to segment AB.