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

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दुई-ओटा समुहको संयोजन (Union of two sets)
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အခြေခံ data အခေါ်အဝေါ်များ

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Geometry
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