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九點圓
Author:
鄭雅輿
GeoGebra
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【案例】2018年全国1卷理科12题
拼砌四邊形
三位數除以一位數（一）
球体的体积推导（优化版）
柱體建築師
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不規則圖形的周界(F)
P53_3b
定周长的正多边形面积变化规律
正三角形堆垛
Copy of Triangular Number
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Special Points
Complex Numbers
Perimeter
Geometry
Reflection