Move point R to change the radius of the circle. Drag sliders d1 and d2 to change the distance from the center to the chord. Note to teachers: If you drag both sliders to zero and then drag them back up, the two segments will become parallel and will appear to be the same chord if the distances are the same. This is helpful for developing the actual theorem.
Jerel L. Welker, Matt James Lincoln Southwest High School Lincoln, NE jwelker@lps.org, mjames2@lps.org