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GeoGebra
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兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
球體建築師
找出對稱軸
拼砌四邊形
Discover Resources
Symmetric設計對稱圖案(一條對稱軸)斜1
index
Slope of a St. Line (formula)
Copy of 周界
一道三视图的题目（三视图作法参考）
Discover Topics
Subtraction
Differential Calculus
Square
Exponent
Geometric Transformations