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GeoGebra
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"Compressed" Astroid as Envelope
Bottema's Theorem
Ellipse as Envelope - Correspondence Method
Pelecoid
Ellipse, Hyperbola and Circle as Envelopes
Discover Resources
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Sin and Cos in Trigo Circle
GoGeometry Action 99!
Telling Time
Velocity-time graph
Discover Topics
Cosine
Inequalities
Tree Diagrams
Ellipse
Trigonometry