本文给出外、内三角形有向面积的两个定理及其若干推论，揭示这些定理与三角形、拿破仑三角形等一些已知结论之间的联系。
In this paper, two theorems of directed areas for exterior (inner) triangles are given, the relations between these theorems and some known results of triangles and Napoleon triangles are revealed.
本文给出外、内三角形有向面积的两个定理及其若干推论，揭示这些定理与三角形、拿破仑三角形等一些已知结论之间的联系。
In this paper, two theorems of directed areas for exterior (inner) triangles are given, the relations between these theorems and some known results of triangles and Napoleon triangles are revealed.
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