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Author:
数豆豆
GeoGebra
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常见四边形是否是双心四边形
折扣
撒针估算面积实验
龙形曲线-分形龙2
平行線的判定
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N邊形滾動
四角柱體（長方體）的截面
Measuring Volume 1
S3 Probability
旋轉長方形
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Algebra
Cuboid
General Quadrilateral
Constructions
Tangent Function