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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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
Identify Opposite, Adjacent, Hypotenuse
Thales' Intercept Theorem

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