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Calculation formula of arc length
The formula for calculating arc length: L=n×π×r/ 180. Arc is a Chinese vocabulary, and the part between any two points on a circle is called arc, which is called arc for short. Mathematics is taught in junior high school and senior high school. The two endpoints of any diameter of a circle divide the circle into two arcs, which are larger than the semicircle and smaller than the semicircle.

Circle can be said to be a very common figure in geometric figures. Many curve problems can be derived from the circle, and the arc is the simplest one. We can easily make a circle with the geometric sketchpad tool, or we can construct an arc on the circle with the geometric sketchpad, that is, construct an arc.

In the construction and installation site, we often encounter circular linear shapes, such as circular structures or decorations in highways, railways, water conservancy, electric power, building construction, municipal landscape engineering, etc. Where there is construction, almost circular alignment is needed. It can be said that how to realize accurate circular arc fixed-point lofting is a problem that every field technician must face. By analogy, three kinds of five common arc lofting methods are summarized. Among them, it is the first time to systematically summarize and put forward two kinds of straightedge methods for arc lofting in workplace. Its advantages are intuitive, simple and easy to operate. Construction workers with junior high school mathematics knowledge can check and recover their shortcomings at any time with the simplest ruler, which is worth popularizing and applying.