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S0E8 一线三等角
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GeoGebra
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撒针估算面积实验
盈利與虧蝕
常见四边形是否是双心四边形
直線的斜率
平行線的斜率
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色彩視覺藝術：奇幻光圈
Reflectional symmetry of Triangular prism
公倍數與最小公倍數（L.C.M.）
三視圖03
平行線的性質的副本
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Geometric Transformations
Piecewise Functions
Similar Triangles
Sequences and Series
Diagrams