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一、知识要点1．尺规作图和基本作图在几何里，把限定用直尺和圆规来画图，称之为尺规作图．最基本最常用的尺规作图，称之为基本作图．2．常用的基本作目有：（1）作线段等于已知线段；（2）作一个角等于已知角；（3）平分已知角；（4）过一点作已知直线的垂线；（5）作已知线
First, knowledge points 1. Ruler Drawing and Basic Drawing In geometry, limit drawing with a ruler and compasses is called ruler drawing. The most basic and most commonly used ruler mapping is called basic mapping. 2. Commonly used basic tasks include: (1) making a line segment equal to a known line segment; (2) making an angle equal to a known angle; (3) bisecting a known angle; (4) passing a vertical line that is known as a straight line; 5) As a known line