Copy of Congruent Chords and Arcs

Show visual relationships involving congruent chords.
1. What does the green line from the center of the circle to the chord represent?[br][br]2. What angle does the green line make with the chord?[br][br]3. Notice that you can rotate the arcs by dragging point E, what can you discover with this information?

Information: Copy of Congruent Chords and Arcs