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angles sum of a triangle 2
Author:
LAM YU SANG
GeoGebra
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長方體平面投影 (Codex版)
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範例：自製工具「格線」
y=ax²的圖形
可變大的圓桌
題六
第五組-畢氏定理
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Isosceles Triangles
Quadratic Equations
Geometry
Probability
Optimization Problems