摘要
给出空间任意一点到等腰四面体4个面有向距离的一个定值性质.
The sum of the directed distances from any point in space to equicrural tetrahedrom＇ s four planes is a definite number.
出处
《平顶山学院学报》
2006年第5期9-11,20,共4页
Journal of Pingdingshan University
关键词
等腰四面体
有向距离
定值
equicrural tetrahedrom
directed distance
definite value
