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Author:
TANG Minh Dung
GeoGebra
New Resources
History of Maths
Pelecoid
van Aubel's Theorem
Stairs (Optical Illusion)
Ellipse, Hyperbola and Circle as Envelopes
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Equations of Two Lines
Adding the Squares to Golden Ratio
Focus-Directrix Definition of an Ellipse
Witch of Agnesi
My Trigonometry
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Coordinates
Isosceles Triangles
Cube
Geometry
Matrices