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1977黑龙江1（3）
Author:
常振虎
GeoGebra
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算柱 (兩位數)
畫出對稱圖形
判斷球體
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
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正方體的反射對稱3
angle at centre vs angle at circumference
congruent (SS)
橢圓截圓錐
多边形的外角和
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Geometric Transformations
Square
Conic Sections
Standard Deviation
Logic