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工程施工中,正五边形多采用“上五九、下九五,八五两边分”的“士”字画法,还有采用圆规、直尺的画法。这些画法多比较复杂,并受工具、条件及工人文化程度的限制。现介绍一种简便易学、精度较高的正五边形近似画法,即“146”法。施工放样时,只要用直角尺按有关边长为1:4:6画两个矩形,即可画出一个近似的正五边形。作图步骤:1.用直角尺先画一个边长为6厘米、宽为5厘米的矩形ABCD,见图1。2.在矩形AC、BD边上,截取
In the construction of the project, the regular pentagon adopts the method of “persons and characters” on the “top fifty nine, the ninety-five, the eighty-fifth, and eighty-five” sides, and the drawing method using compasses and rulers. These painting methods are more complicated and limited by the tools, conditions and workers’ education. Now we introduce an easy-to-learn, high-precision regular pentagonal drawing method, namely the “146” method. When constructing a loft, you can draw an approximate regular pentagon by drawing two rectangles with a side length of 1:4:6 using a square ruler. Drawing steps: 1. Use a square to draw a rectangular ABCD with a side length of 6 cm and a width of 5 cm, as shown in Figure 1. 2. On the sides of rectangles AC and BD, take a snapshot.