Copy of Feuerbach's Theorem

作成者:cornel welster, V8frr

Feuerbach's theorem, which states that the nine-point circle is tangent to the three excircles of the triangle as well as its incircle. Drag A, B and C to see that this reamins invariable for any triangle.

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三角法
算数
ベクトル (三次元)
統計的特性
図