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Author:
孟洪刚
GeoGebra
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Nested spiral octagon
幾何作圖題：切三圓（題目）
美國國旗 (Codex, 2026.10.06)
算柱 (兩位數)
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Homework5
四邊形的特性
國旗腳踏車
拋物線3--平行四邊形法
圆锥曲线
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Hyperbola
Linear Equations
Line Segment
Circle
Upper and Lower Sum or Riemann Sum