The method of reconstructing a trirectangular tetrahedron from a stereo projection made up of two complete quadrangles is put forward.
研究了体视投影的复原问题，提出了根据两个完全四点形为体视投影恢复三直角四面体的方法。
In this paper,we have proved several elementary geometry propositions by using the harmomic property of complete quadrangle,and thus manifested its application in elementaru geometry.
利用完全四点形的调和性质证明了几个初等几何命题,从而体现了它在初等几何中的应用。
According to definitions of the complete quadrangle,the harmonic point range and the harmonic line pencil,the proposition of Desargues,the converse proposition of Desargues and the proposition of harmonic conjugates can solve the problems of 3-line concurrence,4-line concurrence,3-point collineation,4-point collineation,5-point collineation,and 6-point collineation.
由完全四点形、调和点列或调和线束的定义,Desargues命题、Desargues逆命题或调和共轭定理,解决了三线共点、四线共点,三点共线、四点共线、五点共线或六点共线的问题。
diagonal line of a complete quadrilateral
完全四边形的对角线
diagonal point of a complete quadrangle
完全四角形的对边点
a regular polygon formed by completing two equilateral triangles from a regular hexagon.
来自于正六角形的两个完全等边三角形组成的正多边形。
A plane figure with four sides and four angles.
四边形有四个边和四个角的平面图形
A quadrilateral having no parallel sides.
没有平行边的四边形
The Application of Complete Quadrangle s Harmomic Property in Elementary Geometry;
完全四点形的调和性质在初等几何中的应用
parallelogram illusion
平行四边形错觉 平行四边形错觉
I was born in 1961 with a rare facial abnormality. My lower face was totally disfigured.
1961年我一出生，就带着罕见的面部畸形，下半边脸完全变形。
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram.
四个边相等的平行四边形；不是直角的等边平行四边形。
A side exactly equal to others.
等边同其它边完全相等的一边
A quadrilateral having two parallel sides.
梯形一个有两条平行边的四边形
Algorithm for smallest quadrangle encasing box of convex polygon
凸多边形最小面积四边形包围盒算法
A trapezoid is a quadrilateral with two parallel sides.
梯形是具有两平行边的四边形。
The human heart is a four-chambered double pump with its right and left sides fully separated by a septum and subpided on Both sides into an atrium above and a ventricle Below.
人类的心脏是一个四室的双泵,左、右边由隔膜完全分离,两边再被分为上方的心房和下方的心室。
double link jib in parallelogram
平行四边形组合臂架
fundamental period parallelogram
原始周期平行四边形
parallel motion linkage
平行四边形悬挂装置
primitive period parallelogram
基本周期平行四边形