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Tetrahedron 四面體
Author:
Steven S. H. Chu
GeoGebra
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兩組對邊相等的四邊形
近似值：有效數字
直角坐標平面上的旋轉變換
四邊形的特性
異分母分數減法
Discover Resources
Relationships between chords and their distances from centre
平行四邊形
圓在直線上滾動
earth
圖5(動能分析)
Discover Topics
Surface
Cylinder
Mode
Set Theory
Circle