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圆锥曲线折纸操作题（教材案例）
Author:
蔡永志
Topic:
Conic Sections
,
Ellipse
,
Hyperbola
GeoGebra
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兩組對邊相等的四邊形
四邊形的特性
長方體平面投影 (Codex版)
美國國旗 (Codex 版)
算柱 (兩位數)
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拋物線規
Circle
star
外心
垂心
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Subtraction
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Mathematics
Combinatorics