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一个桶八个球
Author:
孟宝兴
GeoGebra
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画直线等分三角形的面积
畫出對稱圖形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
拼砌四邊形
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圓內接四邊形 ABCD ...，求 sinθ=?
Relationships between chords and their distances from centre
重複排列
平面族
圆锥的侧面展开图3D动画的副本
Discover Topics
Boxplot
Integers
Conic Sections
Hyperbola
Circle