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作者：
donald.hall
GeoGebra
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Reflection = 180° Rotation about a Line
Triangle with 3 Right Angles
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Making New Year's resolutions for 2026
bewijs stelling van Pythagoras
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Corresponding Angles of Dilated Triangles (Similar Triangles)
Area of a circle 2
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線性規劃或線性最佳化
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