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假如你只有一把钢尺和一个线团,你知道怎样放直角大样吗?采用下面六种方法可以得到迅速、简便而又准确的效果。一、圆弧线法已知AC是通过圆心的直径,则∠ABC是直角(图1)。目AO=OB=OC,直径上的圆周角是直角。利用这一原理,得出第一条做直角的方法。1.首先由平面图决定基准线AB及基准点B;2.在AB的一侧任意选一点O,并以O为圆心,OB为半径做圆弧,与直线AB交于A;
If you only have a ruler and a coil, do you know how to make a right angle? The following six methods can be used to get quick, simple and accurate results. First, the circular arc method known AC is through the diameter of the center, then ∠ ABC is a right angle (Figure 1). Mesh AO=OB=OC, the circumferential angle on the diameter is a right angle. Use this principle to get the first method of making a right angle. 1. First, determine the baseline AB and the reference point B from the floor plan; 2. Select a point O on the side of AB, and use O as the center of the circle, OB as the arc, and the line AB in the A;