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

Oblation
Extended Law of Sines
Rolo
Evaluating Inverse Trig Functions of Special Ratios
Perimeter and Area

Discover Resources

Cross product with spreadsheet and CAS views.
New Unit 10 Test
ITA - Ακολουθίες n.2
TOUPS EULERS LINE
Parabola tangent

Discover Topics

Vectors 2D (Two-Dimensional)
Expected Value
Special Points
Right Triangles
Coordinates