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Square Action! (Proof Problem 1)

Author:
Tim Brzezinski
Topic:
Quadrilaterals, Square
Creation of this applet was inspired by a tweet from Antonio Gutierrez. Feel free to move points A and B wherever you'd like prior to sliding the slider. Be sure to change the location of point E (soon to appear) as well. How can you formally prove what this applet informally illustrates?

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