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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
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sanjiaohanshu
長方體平面投影 (Codex版)
美國國旗 (Codex 版)
小数 的副本
兩組對邊相等的四邊形
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Proof77 - 楊筑雯
塗鴉
繪製平行四邊形
奈格爾點
Exponential graph
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Arithmetic Mean
Trapezoid
Scalene Triangles
Cuboid
Median Line