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Author:
chen mingchuan
GeoGebra
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四邉形 (四年級) 教師版
Nested spiral octagon
畫出對稱圖形
拼砌四邊形
找出對稱軸
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線之極點定理 / pole of a line theorem
類正五邊形摺法
同頂角_2
ETV 對稱
相似三角形的构造01.许兴华数学
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Complex Numbers
Differential Calculus
Hypothesis Testing
Right Triangles
Rectangle