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等腰三角形性質
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GeoGebra
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异形操场
科赫雪花
龙形曲线-分形龙2
活动三：应用性质
常见四边形是否是双心四边形
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第三冊
Redefining Trigonometry by a Unit Circle
S3 Volume and Area
圓錐截痕模型
數學電腦繪圖與解題
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Area
Equilateral Triangles
Curve Sketching
Perimeter
Inequalities