trirectangular
1. trirectangular quadrilateral
三直角四边形
2. trirectangular spherical triangle
三直角球面三角形
3. trirectangular trihedral
直角三面形
4. 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。