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

Nikmati Keunggulan Di Bandar Judi Terpercaya
Vectors and Components
רישום חופשי
Here comes the sun!
Spherical dodecahedron/icosahedron

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Multiply fractions
Spirals for Sunflower
Laws of Sine and Cosine
Quadratic Graph for 10th Std
Practice Activity on MEAN, MEDIAN AND MODE

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Probability
Hypothesis Testing
Straight Lines
Mode
Combinatorics