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congruent triangles

Author:lamanleung

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兩組對邊相等和有直角的四邊形
判斷球體
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
画直线等分三角形的面积

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bkb-切割线定理
三角柱展開圖
Treće pravilo podudarnosti
中心对称
翰林數學_2下_CH3-1_三角形的外角和

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Orthocenter
Expected Value
Step Functions
Differential Calculus
Equilateral Triangles

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