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Author:
俞光隆
GeoGebra
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找出對稱軸
畫出對稱圖形
美國國旗 (Codex 版)
Nested spiral octagon
sanjiaohanshu
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happy new year2
Apollonius Problem 7 CCP Inversion simple 12
菱形
周界-平移法(練習二)
序列(圆内弦)
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Addition
Continuity
Definite Integral
Line Segment
Reflection