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Ext angle cyclic quad
Author:
Big Lee
GeoGebra
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正方形雪花图案
活动三：应用性质
比較五件物件的重量
常见四边形是否是双心四边形
斜率的值
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KidEdu
對角線
仿生獸
Copy of 均分除法（分數÷整數）
放大／縮小 Resize
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Scalene Triangles
Conic Sections
Multiplication
Linear Functions
Subtraction