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Fun with ellipses
Author:
Dave Van Leeuwen
Topic:
Ellipse
F1 and f2 can be dragged, or entered in the boxes. The distance sum is needed. Directrix info can be displayed. Points on circles rotate in opposite directions with the same orbital time. Their midpoint is traced.
GeoGebra
New Resources
Introduction
Stairs (Optical Illusion)
Ellipse as Envelope - Correspondence Method
van Aubel's Theorem
Rotating Points (Optical Illusion)
Discover Resources
Arc length - Radians
Reflection-8
Limits & Infinity graph
Danielle Dynograph
Groves 2010 Ex 6.4 Q13 Particle Motion
Discover Topics
Tree Diagrams
Functions
Equations
Intersection
Real Numbers