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三角形内角和
Author:
谢鹏
GeoGebra
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兩組對邊相等的四邊形
球體建築師
画直线等分三角形的面积
球体的体积推导
柱體建築師
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Clock
三角函數圖形（全）
旋轉方塊
折扣 例4的副本
S3 Ex4.3 Q04(3D圖)
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Sequences and Series
Median Value
Pythagoras or Pythagorean Theorem
Similar Triangles
Numbers