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Author:
万超杰
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
長方體平面投影 (Codex版)
兩組對邊相等和有直角的四邊形
近似值：有效數字
Discover Resources
tan(α) tan(β) = ?
过圆上一点作切线，三步
[S2] a revised version of Jane’s GeoGebra file (modified by the author)
圖形
盒子的體積的副本
Discover Topics
Upper and Lower Sum or Riemann Sum
Coordinates
Geometry
Kite
Planes