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方位(BA)
Author:
Norman Wong
GeoGebra
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异形操场
龙形曲线-分形龙
百分數及其應用
斐波那契螺旋弧线（表格法-可动态调节）
直線的斜率：水平變化 & 鉛垂變化
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極線獨立定理 / polar independence theorem
How to draw a square with ruler and compasses?
ghseh 二次函數描點法
題 1
Uses of Trigonometry
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Square
Cylinder
Trigonometric Functions
Division
Incircle or Inscribed Circle