有向面积是平面解析几何的向量体系中的概念，表示既有有方向又有大小的面积。和普通的标量面积相对。
利用平面闭折线有向面积的概念和行列式的性质推广了一个面积问题。
This paper studies the area of plane closed folding by complex number method and proves several propositions about area of plane closed folding.
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.
它建立了有向曲面上的曲面积分与它的边界曲线积分的关系。
It gives a relationship between a surface integral over an oriented surface and a line integral along a simple closed curve.
应用推荐