1.) Begin with an arbitrary line segment.
2.) Construct two circles, both having a radius length equal to the length of the segment. One circle's center should be one of the endpoints of the segment, and the other circle's center should be the other endpoint. Mark the intersection of the circles.
3.) Construct segments from each of the endpoints of the original segment to the intersection point marked above.
4.) Hide path objects.
Click here to see the construction in GSP