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The 9-point Conic
Author:
Steve Phelps
In a complete quadrilateral, the midpoints of the six sides (AB, BC, CD, DA, BD, and CA) and the three intersections of the opposite sides (E, F, and G) - nine points in total - lie on a conic.
GeoGebra
New Resources
Ellipse as Envelope - Correspondence Method
Viviani's Window
Introduction
Ellipse, Hyperbola and Circle as Envelopes
Bottema's Theorem
Discover Resources
Reflection
Theorem 11.6.1
iufifif
Trigonometric interpolation - Low frequencies
Week 5 Day 2 Lesson Summary
Discover Topics
Conic Sections
Parametric Curves
Algebra
Fractal Geometry
Geometric Distribution