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Author:Chenwei Chen

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平行線的判定
圓的基本性質
第八周作业
直線的斜率：水平變化 & 鉛垂變化
百分數及其應用

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包絡線
錯角---不平行綫
碎形
圖解兩向量所張開之平行四邊形面積
勒洛四面体（拼接法）

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Reflection
Rectangle
Statistics
Cuboid
Vectors 3D (Three-Dimensional)

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