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Right triangle
Author:
chihchengliang
GeoGebra
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常见四边形是否是双心四边形
盈利與虧蝕
斐波那契螺旋弧线（表格法-可动态调节）
第八周作业1
百分數及其應用
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excenter of triangle
外角和
In-centre
正方体展开图的副本
sin(x) 的函數圖形的副本
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Inequalities
Addition
Algebra
Numbers
LCM and GCD