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

Angles of Intersecting Lines
z`]]
Graph of y = ax² + bx + c
גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
Drunk Parabola

Discover Resources

Circle and Chord bisector
Guided Notes
running
e, telo... 1
Blank Classic Template with Pen Tool

Discover Topics

Limits
Curve Sketching
Congruence
Pie Chart or Circle Chart
Exponential Functions