Line Segment Bisector, Right Angle

How to construct a Line Segment Bisector AND a Right Angle
using just a compass and a straightedge


  • Place the compass at one end of line segment.
  • Adjust the compass to slightly longer than half the line segment length
  • Draw arcs above and below the line.
  • Keeping the same compass width, draw arcs from other end of line.
  • Place ruler where the arcs cross, and draw the line segment.