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Author:
李政憲
GeoGebra
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錐體建築師
拼砌四邊形
【案例】2013年安徽高考15题
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
極線對偶定理 / polar duality theorem
補角關係
內擺線
圓周_心算題01
蝴蝶定理（唐老师的课程）
Discover Topics
Trapezoid
Fractal Geometry
Equations
Arithmetic Operations
Differential Calculus