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餘弦定理
Author:
yuchengda
GeoGebra
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拼砌四邊形
画直线等分三角形的面积
四邊形的特性
畫出對稱圖形
球體建築師
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数轴上的整数加法
正八角錐(旋轉，實體、透視)
Angle at Centre and Angle at circumference
S4 Quadratic Function
活工(二)Q2
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Means
Pyramid
Vectors
Differential Equation
Special Points