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勒洛四面体（参数曲面法）
Author:
孟宝兴
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
柱體建築師
兩位數除以一位數（二）
畫出對稱圖形
Discover Resources
數學作業
測試
Copy of 立體圖形－截面
test05
三角形面積公式 1/2 bc sinA的副本
Discover Topics
Numbers
Geometry
Mathematics
Planes
Secant Line or Secant