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Author:
Gideon Huang
GeoGebra
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近似值：有效數字
拼砌四邊形
畫出對稱圖形
四邊形的特性
球體建築師
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緯度、日照、影子長。
切線性質
比較角的大小
異分母分數除法
内外弦图1
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Percentages
Plane Figures or Shapes
Polygons
Pyramid
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