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Nine Point Circle
Author:
Esther Gruenhut
Topic:
Circle
Euler, Feuerbach, etc.
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And if that wasn't enough:
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Move point P to see what happens when you reflect the orthocenter through the points on the nine point circle.
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New Resources
Poorly Drawn Parallelograms
Variation Theory Parallelogram Proofs
Blancmange curve (fractal)
探究由平行線和截線所成的角
Quiz: Finding Average Rate of Change
Discover Resources
ASA Similarity
Conic's Eccentricity_20170208
Part 9
Pedal Curve of a Parabola and Focus
Projectile Motion
Discover Topics
Linear Programming or Linear Optimization
Trapezoid
Quadratic Equations
Cosine
Rectangle