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

Prism Drawn in 1-Point Perspective
အခြေခံ data အခေါ်အဝေါ်များ
רישום חופשי
Reflection across a line
Pitfalls of Disk/Washer Method

Descubrir recursos

Coordinate Plane
Rotation of a figure(5 -vertex)
TrigRatios e
三角比の拡張

Descubre temas

Ortocentro
Triángulos Equiláteros
Vectores
Ángulos
Segmento