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定长线段在相交直线上滑动
Autore:
冯伟冀
GeoGebra
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Nested spiral octagon
近似值：有效數字
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
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Polygon incised
Interest（利息）
Cuboid 長方體
門格海綿
两角和的正弦公式几何证明（改进）
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Frazioni
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Diagrammi
Equazioni lineari
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