To do so, first draw a line segment using the red and green points as endpoints. Next, draw two circles just as we did in Constructing An Equilateral Triangle. The first circle is centered at the red point and passes through the green point. The second circle is centered at the green point and passes through the red point.

Next, find the two points of intersection for the circles you just drew. Now, draw a line through these two points of intersection. And finally, intersection this line with the line segment you drew at the beginning.

This point of intersection is the midpoint of the red and green points. Can you explain why?