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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
Construct a Square
van Aubel's Theorem
"Compressed" Astroid as Envelope
Viviani's Window
Spinning cube - Belt Trick
Discover Resources
Janna's problem set 1
dynamic texts
Spring-Mass Motion with sin(3t) Forcing Function
transf
Zlati rez. trikotnik---
Discover Topics
Upper and Lower Sum or Riemann Sum
Step Functions
Diagrams
Volume
Bar Chart or Bar Graph