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月餅
Author:
周郁智
GeoGebra
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四邉形 (四年級) 教師版
找出對稱軸
異分母分數減法
畫出對稱圖形
画直线等分三角形的面积
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四角柱體（長方體）的截面
Decimal
規律幾何圖形珠串
两角和的正弦公式几何证明1
莱诺三角形 Reuleaux Triangle及其特性
Discover Topics
Perimeter
Tree Diagrams
Circumcircle or Circumscribed Circle
Means
Triangles