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大家都知道,用尺规将线段均分成偶数段很容易,即在被分的线段上不断截取中点就行.怎样把线段均分成奇数段?下面给出简便易行的方法.例1把线段AB三等分.作图:1.如图1,以点B为圆心,线段AB为半径作圆,又以点A为圆心,线段AC为半径作圆(点C是AB中点),交圆B于D;2.作∠ADB的平分线交AB于E,则AE是AB的三分之一;3.以E点为圆心,线段AE为半径作弧,
As we all know, with the rules of the line is divided into even segments of the line is very easy, that is divided into segments on the continuous interception of the midpoint on line. How to divide the line into odd segments? The following gives an easy way. AB three equally.Plotting: 1. As shown in Figure 1, the center of point B, AB for the radius of the circle, again to point A as the center, the line segment AC for the radius of the circle (point C is AB midpoint), pay Circle B in D; 2. for ∠ ADB bisector of the intersection of AB in E, AE is one-third of AB; 3. to E point for the center, the line segment AE for the arc,