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forum 4.1.2009
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GeoGebra
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Bottema's Theorem
van Aubel's Theorem
Stairs (Optical Illusion)
Ellipse, Hyperbola and Circle as Envelopes
"Compressed" Astroid as Envelope
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Creations
W3 Mini-Quiz #12 Emma B.'s claim...
Triangle_Montgomery
PR2b-01-P3-Q3 Solving Multiplication Equations using Scales
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Matrices
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Natural Numbers
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