Quadrilateral Surprise!

Author:Tim Brzezinski

How would you put this property (dynamically illustrated below) into words? (Applet works best if quadrilateral is kept convex.) How can you formally prove what this applet informally illustrates?

Quick (Silent) Demo

New Resources

רישום חופשי
Bessel Function
အခြေခံ data အခေါ်အဝေါ်များ
bewijs stelling van Pythagoras
JLA Copy of Eri Chan

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