【摘要】 为了确定图形中的圆,需要知道它的3个条件,例如相切的条件或圆自身的尺寸.根据这一原理,可知在直角座标系中具有简单相切条件的圆的作图有29种类型,作者分析介绍了用圆规和直尺画这些圆的方法。更多还原

【Abstract】 In engineering drawings, three reguirements are usually given to construct circle. They could be, for example, tangential conditions or dimensions. Based on this principle, there are 29 types of circles constructing in Cartesian rectangular coordinate which has simple tangential condition. The method of constructing these circles by rules and compass are presented in this paper.更多还原