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內次擺線
Author:
陳科旭
GeoGebra
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比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
圓的切線方程
活动三：应用性质
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简易立体几何
Addition of 2 Directed Numbers
正四面體對邊向量垂直作圖證明
六角形(草稿)
六年級 圓周
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Sine
Set Theory
Means
Circumcircle or Circumscribed Circle
Triangles