Quadrilateral Surprise!

Autor: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

Nuevos recursos

Untitled
Other Variations of Cosine
apec
General Polar Equation of Conics with Rotation (2)
Rolling a Square

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Quiz on Percentage Profit & Loss 盈虧百分率測驗
Hexagons, True or False
implicit quadratic
Finding a missing Angle
Murto- ja sekaluvut

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Aritmética
Rotación
Números Complejos
Raíz
Trapecio