How to make a perpendicular bisector.

                                            This is how to make a perpendicular bisector

1. Open the compass to just over halfway of line segment
2. Sharp point at point A makes an arc
3. Sharp point at point B make an arc
4. With ruler join the 2 intersectims of the arc.                  For example the points.

  Hope This Helped!                                                           A-----------o-----------B