CAD练习题18——利用固定角度三角形画不规则多边形

题目:

https://github.com/longlongpicture/myblogpicture/raw/master/p18-6.PNG

这道题不大好用平行四边形了,因为75度下边对应的两个角的度数目前都不知道,这就导致没法作目标直线的平行线。所以我们不妨换个思路。

1、先画已知部分。

https://github.com/longlongpicture/myblogpicture/raw/master/p18-1.PNG

2、连接两个端点,构成三角形,这时,我们发现上边要画的部分就是固定顶角三角形,这时就好下手了。

https://github.com/longlongpicture/myblogpicture/raw/master/p18-2.PNGhttps://github.com/longlongpicture/myblogpicture/raw/master/p18-3.PNGhttps://github.com/longlongpicture/myblogpicture/raw/master/p18-4.PNGhttps://github.com/longlongpicture/myblogpicture/raw/master/p18-5.PNG

3、清理图形。

https://github.com/longlongpicture/myblogpicture/raw/master/p18-6.PNG