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正八面體
Author:
黃國斌
GeoGebra
New Resources
球体的体积推导（优化版）
判斷球體
柱體建築師
畫出對稱圖形
兩組對邊相等和有直角的四邊形
Discover Resources
mathmathmath
圖解定理公式與切割組合
平行四邊形
Apollonius Problem gergonne 3
拋物線2-焦點法
計算圖形周界（小六下）
Discover Topics
Vectors
Boxplot
Kite
Triangles
Linear Equations