一、前言本文所介绍的程序能识别直线的法线式、点斜式、两点式。能识别两已知圆(可退化成点)的公切线,以及与已知圆相切与坐标轴成已知角的直线。能识别已知圆心坐标和已知半径的圆,以及与两已知圆(或点)公切的已知半径的圆。能在运算过程中自动添加过渡圆与过渡线(即加工图形中的两圆 I. Preface The procedure introduced in this paper can identify the normal line, point oblique, two-point type. A common tangent to two known circles (degenerate into points) can be identified, as well as a straight line tangent to a known circle at a known angle to the coordinate axis. A circle that recognizes a known circle’s coordinates and a known radius, and a circle of known radius that is common to both known circles (or points). In the calculation process can automatically add the transitional and transitional lines (that is, machining two circles in the graph