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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
Odd or Even
Angles and Intersecting Lines: Quick Investigation
Teorema Japonês para quadriláteros inscritos em uma circunferência
Drag that Point!
Rotating Points (Optical Illusion)
Discover Resources
Exponential decay with dice
Fake geometric progression
مقطع متوازي مستطيلات بمستو يوازي أحد وجوهه : المدرّس شادي سمعان
Proposistion Pt2
גילוי משפט פיתגורס ומשפט הקוסינוסים
Discover Topics
Intersection
Matrices
Circumcircle or Circumscribed Circle
Area
Expected Value