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

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montecarlo circles 5
函數的奇偶性
အခြေခံ data အခေါ်အဝေါ်များ
montecarlo circles 1
From Polar to Cartesian Coordinates

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Uppgift 2.2
Semnul functiei de gradul I
AM 2016 P1 Q2
Apex Section 9.2 Problem 20
Dot Product

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Differenzenquotient und Steigung
Korrelation
Modus
Ungleichungen
Kreisdiagramm oder Kuchendiagramm oder Tortendiagramm