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折線1
Author:
chen mingchuan
GeoGebra
New Resources
四邉形 (四年級) 教師版
球体的体积推导（优化版）
找出對稱軸
畫出對稱圖形
異分母分數減法
Discover Resources
錯覺藝術
幾何變換
glt-c05-05 正四角錐旋轉
Locus (Parallel)
PMC 2017-18
Discover Topics
Subtraction
Secant Line or Secant
Incircle or Inscribed Circle
Polygons
Rectangle