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

apec
Damped Trochoidal Curve
z`]]
အခြေခံ data အခေါ်အဝေါ်များ
bewijs stelling van Pythagoras

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PMC 2013-14 Q10
Polynomial Roller Coaster
EMAT_3900_F16_Problem_Set_2_Square_RILEY
constructing a 90 degree angle
ITA - Tangent and secant theorem n.1

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Volumen
Cuadriláteros
Intersección
Parábola
Test de hipótesis