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複合形體的表面積（色彩、凹形）
Author:
Lionheart William
GeoGebra
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Nested spiral octagon
美國國旗 (Codex, 2026.10.06)
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長方體平面投影 (Codex版)
畫出對稱圖形
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單位圓上的三角函數
線性規劃例10
If指令的應用1
方形地毯
十六菊
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Scalene Triangles
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