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三角形
Author:
vincent21891
Topic:
Triangles
GeoGebra
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平行線的判定
常见四边形是否是双心四边形
直線的斜率：水平變化 & 鉛垂變化
直線的斜率
折扣
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this is math pic
題 7
三角形的分割與組合(2)
過點切圓的動圓圓心軌跡
二次函数
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Addition
Straight Lines
Trigonometric Functions
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