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Copy of Congruent Chords and Distance from Center

Congruent Chords in Circles You can change the lengths of chords CD and EF by dragging either endpoint. Observe the affect on the distance from A to the midpoint of each chord.
1. What relationship do you observe as the length of a chord increases? How about when the chord length decreases? 2. What is observed when the chords are congruent?