The angle in degrees measured clockwise from North.
It is common to put extra "0"s to make it a full 3 digits, so:
• North is 000°• East is 090°• South is 180°• West is 270°
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。