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

Perimeter of Rectangle
seo tool
Parallelogram Anatomy
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Discover Resources

#91 Midpoints triangle & segments joining reflections
Activity 5a: Composite Reflections
Code Breaker 6

Discover Topics

Terms
Tree Diagrams
Arithmetic Operations
Trigonometry
Intersection