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1977天津2（2）
Author:
常振虎
GeoGebra
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拼砌四邊形
判斷球體
算柱 (兩位數)
錐體建築師
【案例】圆柱体内放置一个大球六个小球
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有向角
相似形_Collection
數學傳播39卷4期, 平面幾何公式思考
橢圓1--同心圓法
折纸成抛物线
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Unit Circle
Linear Regression
Line Segment
Parallelogram
Scalene Triangles