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Author:HYHivy, GeoGebra Institute of Hong Kong

計算下圖的面積。

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美國國旗 (Codex 版)
兩組對邊相等和有直角的四邊形
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畫出對稱圖形

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n等分點
三角形數
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基础知识
利用頂點描述二次函數的複本

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Geometry
Similar Triangles
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