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勒洛四面体（参数曲面法）
Author:
孟宝兴
GeoGebra
New Resources
Earth with coastline
找出對稱軸
近似值：有效數字
長方體平面投影 (Codex版)
兩組對邊相等的四邊形
Discover Resources
二次函數的圖形
扣球路徑求直線方程式(隨機出題)
心臟線
GGB 教程
折纸角度探究2
Discover Topics
Intersection
Vectors 2D (Two-Dimensional)
Scatter Plot
Limits
Volume