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垂徑定理
Author:
eyun306
GeoGebra
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兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
找出對稱軸
近似值：有效數字
長方體平面投影 (Codex版)
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三角形的外心
binary number system
第四冊 3-4 大角對大邊
Orthocentre
幾何板上的等腰梯形
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Cylinder
Volume
Curve Sketching
Linear Programming or Linear Optimization
Surface