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ptcc trigo level 2
Author:
Cheung Wing Chuen
GeoGebra
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球体的体积推导
柱體建築師
錐體建築師
兩組對邊相等的四邊形
三位數除以一位數（二）
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龍騰4_1-1講段7
三角形分類
ggb创作
两角和的正切公式几何证明
任務4的副本
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Scalene Triangles
Arithmetic Mean
Congruence
Median Line
Multiplication