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九點圓

Author:蔡鈞富

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判斷球體
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
找出對稱軸

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整數÷整數_工作紙（一）_題7
周界
基華小學 GeoGebra 幾何創作室第 3 節
验证勾股定理
蜗牛壳模型

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Equations
Histogram
Cylinder
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