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外心

Author:Jensen Wong

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兩組對邊相等的四邊形
拼砌四邊形
畫出對稱圖形
直角坐標平面上的旋轉變換
四邊形的特性

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斯坦納-雷米歐司(Steiner-Lehmus)定理推廣
圓錐與扇形之關係
semops_錐體
P4面積
与椭圆焦点三角形外角平分线有关的轨迹.许兴华数学

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Sphere
Median Line
Isosceles Triangles
Histogram
Rotation

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