What is the diameter of the cross section of the threaded steel?
There are many ways to measure diameter. Different methods are adopted according to different precision requirements,The simplest method is to use the scale directly, and the longest line through the section is the diameter. This method has the lowest precision
Upstairs method is also OK: use a rope around the thread steel for a week, and then take out the length of the string, that is, thread steel perimeter L, and then according to the perimeter formula, you can find the diameter of D=L/ Pi Pi =3.1415926.The most accurate way is to use a vernier caliper or a micrometer.
The cross section of a threaded steel is a circle, and the diameter of any line passing through the center of the circle is the diameter.
