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圖一

Author:GeoGebra Institute of Hong Kong

Topic:Circle

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美國國旗 (Codex 版)
畫出對稱圖形
Nested spiral octagon
找出對稱軸
Earth with coastline

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形心
雙曲線的頂點
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
正角、負角|Positive angles & Negative angles
曲線所圍區域的面積 (The Area between Curves)

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Linear Functions
Vectors 2D (Two-Dimensional)
Arithmetic
Root
Symmetry

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