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Equal arcs, equal angles
Author:
Leo Chui
GeoGebra
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活动三：应用性质
三角函数 的副本
盈利與虧蝕
撒针估算面积实验
常见四边形是否是双心四边形
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面積：從梯形到三角形 02
Apollonius Problem poncelet fouche
定积分的概念（移动端）
函数奇偶性的图像特征
拼圖2
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Trigonometry
Congruence
Means
Reflection
Ellipse