Quadrilateral Surprise!

Author: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

New Resources

seo tool
רישום חופשי
Which Quadrilateral is Which?
Transforming Random Variables
Discriminant of y = ax² + bx + c

Discover Resources

Hae Cell Phone Map
Test
Investigating Planes
benzen
Mama Rabbit

Discover Topics

Quadrilaterals
Incircle or Inscribed Circle
Random Experiments
Constructions
Coordinates