垂足三角形 meaning in Chinese

pedal triangle

A discussion from the triangle with foots of three perpendiculars
从垂足三角形谈起
On some theorems of directed area for pedal triangles
关于垂足三角形有向面积的一些定理
Abstract : this paper gives a formula of directed area for pedal polygon of polygons inscribed in a circle . using this formula , we obtain some fixed value theorems for this kind of pedal polygins . thus some results of pedal triangles are generalized
文摘:给出圆内接多边形的垂足多边形的有向面积公式，并利用该公式获得圆内接多边形的垂足多边形和正多边形的垂足多边形的若干结果，从而推广了垂足三角形的一些结论。