confocal conics Two central conics are confocal if they have the same foci. An ellipse and a hyperbola that are confocal intersect at right angles.
confocal conics
数学辞典收录了4151条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。