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蝴蝶定理證明1：Steven構造恒等式
Author:
連琨銘
GeoGebra
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画直线等分三角形的面积
畫出對稱圖形
判斷球體
兩位數加法
算柱 (兩位數)
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Circle on a Sphere
保持2:3:4
[洋葱] 平面直角坐标系中的相似-上(0055)
解三角形（１）
蚂蚁爬行
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Limits
Numbers
Terms
Planes
Circumcircle or Circumscribed Circle