Reason:
Draw a line from the point A as shown.
Set the compass to create a small arc. Place the spike of the compass at the point A, draw a small arc as shown.
Keep the same compass setting. Place the spike of the compass at the point where the 1st arc crossed the line, draw a 2nd small arc as shown.
Keep the same compass setting. Place the spike of the compass at the point where the 2nd arc crossed the line, draw a 3rd small arc as shown.
Join the point where the 3rd arc crossed the line to the point B. Prepare to construct parallel lines using a set square and a straight edge.
Construct parallel lines as shown. The line segment [AB] is divided into 3 equal segments.

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