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等腰三角形求角度
Author:
普华祥
,
arist
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩位數加法
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三節棍的軌跡
斜線2
鉛筆畫圓
用方程解周界問題
數學素養試題
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Similar Triangles
Incircle or Inscribed Circle
Rotation
Perimeter
Trigonometry