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Orthocentre

Author:Big Lee

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兩組對邊相等和有直角的四邊形
sanjiaohanshu
近似值：有效數字
四邊形的特性
直角坐標平面上的旋轉變換

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幾何萬花筒(難度90%)
三角形外心
小六平均數 (供教師講解用)
三垂線定理
圓外切四邊形

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Similar Triangles
Prism
Real Numbers
Congruence
Equilateral Triangles

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