尺规作图的方法和步骤:
1、如有ab两点,用尺画出;
如只有a点,用规取长度,画圆,用尺连线即是线段。
如ab皆无,先用尺做出直线,然后用规进行定长
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/f11f3a292df5e0fea13af2944e6034a85edf7200?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、在直线上任定两点ab,用规取a点为圆心b点为圆上一点画圆,用规取b点为圆心a点为圆上一点画圆,用尺连ab即是
3、ab已经确定,重复2
4、在角的两遍用规取等长,连接两点,重复3,即得到![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/3812b31bb051f8192d0578dfc8b44aed2e73e707?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、用规取长度D,以直线上一点P为圆心,做圆弧AB,交点为A。在直线上另一点Q做同样圆弧CD交点为C且与AB同侧。用规取长度d,以A为圆心,交AB于M,以C为圆心,交CD于N,则MN即平行于a