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两条直线平行条件探究

Author:袁正铎

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平行線的判定
龙形曲线-分形龙
龙形曲线-分形龙2
双心四边形
常见四边形是否是双心四边形

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正四面體的旋轉對稱
zuiduan
向量的伸縮
立面化設計基礎-角錐及展開圖
「相似三角形」任务1的副本

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Multiplication
Vectors
Scalene Triangles
Trigonometric Functions
Constructions

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