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三角函數的性質
Author:
yuchengda
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
球体的体积推导（优化版）
球體建築師
找出對稱軸
画直线等分三角形的面积
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商高定理1
任務1
Internal tangent
Twghmkc_算柱
祖暅原理
Discover Topics
Sine
Similar Triangles
Rectangle
Line Segment
Circumcircle or Circumscribed Circle