directions on how to construct a segment
Mark a point R that will be one endpoint of the new line segment. Set the compasses' point on the point P of the line segment to be copied. Step 3. Adjust the compasses' width to the point Q. The compasses' width is now equal to the length of the line segment PQ. Without changing the compasses' width, place the compasses' point on the the point R on the line you drew in step 1. Without changing the compasses' width, Draw an arc roughly where the other endpoint will be. Step 6. Pick a point S on the arc that will be the other endpoint of the new line segment.