单词	perpendicular planes
释义	Perpendicular Planes It is the idea that the two planes are at right angles. FIRST for a line to be perpendicular to a plane it must be at right angles to all lines on the plane that intersect it. THEN if another plane contains that line then the two planes are perpendicular.
随便看	root root mean square rotation rotational symmetry rounding row rpm rule of 72 ruler run salary sale price sales tax sample sample point sample space satisfy saving savings account savings bond scalar scale scale drawing scalene triangle scales

数学辞典收录了1200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。