摆线、圆的渐伸线、星形线是高等数学教学中经常遇到的重要曲线.下面给出用几何画板(4.05版)作这些曲线的方法.1摆线的作法方法1用摆线的定义作图.设计要点:利用圆在直线上滚动的距离等于圆心移动的距离,用平移变换得到轨迹点.作法:1作线段AB,点C;以C为圆心,AB为半径作圆C1.2过 Cycloid, rounded involute line, the star line is often encountered in higher mathematics teaching important curves. The following is given with the geometric board (version 4.05) for these curves .1 cycloid approach method 1 with cycloid The design of the main points: the use of the circle in a straight line on the rolling distance equal to the distance from the center of the circle, using translation transform to get track points. Method: 1 for the line segment AB, point C; C as the center, AB radius for the circle C1 .2 too