Quadrilateral Surprise!

Auteur: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

Nieuw didactisch materiaal

Model sferyczny - dwunastościan-dwudziestościan
apec
Slope Between 2 Points (Phase 2)
Slope and Road Signs
רישום חופשי

Ontdek materiaal

Reflections across parallel lines
Ellipse, with foci and directrices
Pythagoras's Theorem
H1.12
Chain Rule for x^2 sin(8/x)

Ontdek onderwerpen

Beschrijvende maten
Integraalrekenen
vermenigvuldigen
Cilinder
Rechte lijnen