Perpendicular bisector

Author:
Chi Tran, Mathguru, goldsteinm
Why is segment CD a perpendicular bisector?
GeoGebra Applet
Move point D. What do you notice? What type of triangle does the perpendicular bisector create? Move point D until side AD measures 6.68. What kind of triangle does the perpendicular bisector create now? Move point D until it is right on point C. What is point D called now?

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