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凸透鏡的成像（理想）
Author:
joeyliaw.tw
GeoGebra
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美國國旗 (Codex, 2026.10.06)
Nested spiral octagon
三半圓間的相切圓(Codex╱2026.10.07)
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重複組合
內心
角平分線性質
彩色斜線區域1060325
可控坐标系
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Division
Angles
Functions
Conic Sections
Polygons