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wave_Huygens diffraction
Author:
geotongsir
GeoGebra
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Pythagorean Day
MC #2
從邊長辨認四邊形
Luxembourg Symbol
畫三角形
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Geometry Sketches for iBook
Graphing Coordinates
Puzzle game-5
practice
CA GGB Polynomials 001
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Polygons
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Conic Sections
Cone
Rational Numbers