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Author:
chihchengliang
GeoGebra
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圓的基本性質
斐波那契螺旋弧线（表格法-可动态调节）
撒针估算面积实验
平行線的判定
活动三：应用性质
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商高定理\水2
CircleRoundCircle
gjh-h02-01 歐幾里德的畢氏證明
S3 WS4.3 Q02(3D圖)
连续开方（制作：谢建华，修订：孟宝兴）
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Rotation
Upper and Lower Sum or Riemann Sum
Reflection
Angles
Complex Numbers