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Author:
chen mingchuan
GeoGebra
New Resources
球體建築師
錐體建築師
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（一）
Discover Resources
Angle Sum in a Triangle
Version 2
交錯弓形的圓周角
正四面體的旋轉對稱
外心(劉虹圻 高二三26)
Discover Topics
Circle
Algebra
Variance
LCM and GCD
Polygons