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孟氏定理 (Menelaus' theorem)
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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錐體建築師
四邊形的特性
算柱 (兩位數)
兩組對邊相等的四邊形
判斷球體
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太极图
線性組合
-3 ≤ cosA+cosB+cosC ≤ 3/2
正12面體內的正四面體製作
勾股定理的直观证明（义务教育数学 新课标-例82）
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Quadrilaterals
Logarithmic Functions
Arithmetic Operations
Statistics
Tangent Line or Tangent