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弧度的理解
Author:
军云
GeoGebra
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科赫雪花
斐波那契螺旋弧线（表格法）
双心四边形
异形操场
平行線的判定
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Symmetric 設計對稱圖案(一條對稱軸)(垂直)
Tedt
長方體的體積
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三角函数定积分的动态演示.许兴华数学
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Vectors 2D (Two-Dimensional)
Diagrams
Angles
Sequences and Series
Volume