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Perpendicular Time
Author:
Neil
How many times a day are the minute and hour hand perpendicular?
GeoGebra
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van Aubel's Theorem
Limaçon / Cardioid as a Locus - A Classical Construction
Angles and Intersecting Lines: Quick Investigation
Rotating Points (Optical Illusion)
Construct a Square
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DoppellogPapier
Menelaus.
Pythagoras Theorem
Meaning of Permutations & Combinations 排列與組合的意義
#11 Draw a regular hexagon
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Percentages
Polygons
Quadratic Equations
Rhombus
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