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正四面體

Author:Max Wong

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近似值：有效數字
兩組對邊相等的四邊形
畫出對稱圖形
球體建築師
四邉形 (四年級) 教師版

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兩個圓的中點軌跡
包絡菱形
△ A B E △ABE 、 △ A C E △ACE 的內切圓半徑分別為 r 2與 r 1,兩者可以互換嗎
橢圓3-平行四邊形法
我的第一个GGB绘本

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Difference and Slope
Constructions
Incircle or Inscribed Circle
Hypergeometric Distribution
Vectors 2D (Two-Dimensional)

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