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分數加法

Author:iedc

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兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
找出對稱軸
四邉形 (四年級) 教師版
畫出對稱圖形

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平行四邊形面積
圖H
圓與切線
方圓面積
rotational symmetry_3

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Incircle or Inscribed Circle
Polygons
Area
Circle
Rational Numbers

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