Describe a process you would use to create the perpendicular bisector to a segment ab using only an unmarked straightedged and an unmarked compass

We need to draw a perpendicular bisector to a segment AB using only an unmarked straightedges and an unmarked compass.

The steps of construction are:

1. Using straightedges draw a line segment AB.

2. Set the length of compass larger than the segment AB.

3. Place the compass on point A and draw arcs on both sides of the line AB.

4. Place the compass on point B and draw intersecting arcs on both sides of the line AB.

5. Now, mark both intersection points.

6. Connect the intersection points by straightedges.

if x = 1, then the answer is 3.5