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.

New Resources

apec
Visualizing the Pythagorean Identity with Sine and Cosine
From Polar to Cartesian Coordinates
Neuberg's Theorem
Slope Between 2 Points (Phase 2)

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AA similarity theorem (no timer)
Angles and Arcs Vertex Inside
week 11, lecture 2, graph 2, directional derivs of plane
Découverte de Géogébra

Discover Topics

Poisson Distribution
Optimization Problems
Geometric Distribution
Geometric Transformations
Quadratic Equations