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勒洛四面体（拼接法）
Author:
孟宝兴
GeoGebra
New Resources
算柱 (兩位數)
畫出對稱圖形
Fibonacci Clock
長方體平面投影 (Codex版)
第八周作业
Discover Resources
已知橢圓 x^2/a^2+y^2/b^2=1 (a>b>0)
COS 特別角
斯坦納-雷米歐司(Steiner-Lehmus)定理推廣
纏繞畫1
判斷球體
Discover Topics
Median Line
Reflection
Symmetry
Statistics
Vectors