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Ex5D#8
Author:
Big Lee
GeoGebra
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常见四边形是否是双心四边形
圓的基本性質
正方形雪花图案
祖冲之的期望：内棋与外棋
直線的斜率：水平變化 & 鉛垂變化
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正四面體的旋轉對稱
判斷錐體 2
IMO2015D
门禁系统
立體三角測量(例五)
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Planes
Percentages
Plane Figures or Shapes
Cone
Scatter Plot