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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
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【案例】2013年安徽高考15题
柱體建築師
拼砌四邊形
錐體建築師
兩位數除以一位數（一）
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圓與三角形中點的軌跡
Locus (Parallel lines)
曲线
三視圖02
轉移矩陣 (馬可夫鏈)的副本
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Ellipse
Mode
Congruence
Perimeter
Trapezoid