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有趣的梯形面積問題
Author:
Cychoy
GeoGebra
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兩組對邊相等的四邊形
【案例】2013年安徽高考15题
兩位數除以一位數(二)
兩組對邊相等和有直角的四邊形
找出對稱軸
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proof50 劉邦佑
不規則圖形的周界(intro)
旋转直角
數學傳播39卷4期, 平面幾何公式思考
N-ellipse
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Orthocenter
Vectors 3D (Three-Dimensional)
Ellipse
Trapezoid
Triangles