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

גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
Linear Equation Graphs: Thin Slice
Congruent Figures
Pythagorean Template: Integer Legs
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Discover Resources

Example 3
Enhedscirkel
karina.zurezva
Simple Harmonic Motion

Discover Topics

Natural Numbers
Scalene Triangles
Complex Numbers
Median Line
Hyperbola