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

WC 2018
bewijs stelling van Pythagoras
Loyd's Two-Greek-Crosses-to-a-Square Dissection
רישום חופשי
Fractals: The Pythagoras tree

Discover Resources

Step 7
Rhombus and Square OliviaSimmonds
YFlotaG1
Flower
V is for Vector

Discover Topics

Right Triangles
Isosceles Triangles
Curve Sketching
Hypothesis Testing
Root