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垂心軌跡
Author:
黃國斌
GeoGebra
New Resources
画直线等分三角形的面积
球体的体积推导（优化版）
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
Discover Resources
極線對偶定理 / polar duality theorem
combos ()
利用對摺找內心
蜥蜴
统计图表制作
Discover Topics
Reflection
Scalene Triangles
Conic Sections
Histogram
Variance