This examples shows how to divide a line into two equal parts using a compass and ruler.
Start with a line with two end points.
Draw an arc outward with a radius equal to the distance between the two points.
Repeat this process with the other point. Label the two points where the arcs intersect.
Draw a line between the two points and label where the line intersects the original line.
We have finished dividing the line into two equal parts.