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

Pathway to Proof: Triangle Angles
seo tool
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Fourier Lissajous (Mechanical)
Model sferyczny - dwunastościan-dwudziestościan

Descubrir recursos

Hole 5
Reconstrucción de un triángulo por el caso LLL
EuclideanGCD11
Triangle Dilations
Velocity and Kinetic Energy

Descubre temas

Trapecio
Gráfico de Barras
Círculo unitario
Polígonos
Simetría