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圓與切線
Author:
WU CHUNG WEI
GeoGebra
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多邊形的面積
平行線的判定
圓周公式的應用
常见四边形是否是双心四边形
直線的斜率
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認識GeoGebra--相似三角形
立方體截痕
Net of cone
向外延伸的多邊形
根據百分率找數量（一）: 例4的副本
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Variance
Diagrams
Geometric Transformations
Means
Incircle or Inscribed Circle