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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?
GeoGebra
Quick (Silent) Demo
New Resources
Stairs (Optical Illusion)
History of Maths
Slope Field (1)
Introduction
Cross Product in 2D and 3D
Discover Resources
Triangle Side-Angle Relationships
Face Creation Through Reflection version 2
Area of trapezium -- dissection
Untitled
Unghiuri dintre indicatoarele ceasului (de perete).
Discover Topics
Sphere
LCM and GCD
Hyperbola
Median Line
Random Variables