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.

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Tube at distance of a 3D curve.
Pendulum Snake
Comparing Two Quantities by Percentage
seo tool
Sticky point to list of points

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Quadrilateral indroduction
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spiraling day 35 proof
Untitled
Fraction Models

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Special Points
Ellipse
Probability
Complex Numbers
Integral Calculus