From scale 1 on the scale to scale 8, the length is 8 cm.

Error, the scale from zero to eight is 8 cm.

12 inch ruler has 13 punctuation marks. Such a ruler can measure all integer lengths between 1 and 12 inch.

Ruler history:

Ruban. Ancient people used ordinary tools to measure the length. For example, the ancient Egyptians used ropes to measure land. Some people put forward the idea that a part of the body can be used as a measuring tool. For example, the distance between the two ends of thumb and middle finger is called 1 degree, and the distance between the two hands is called 1 degree when the adult's arm is horizontally stretched left and right. In ancient China, when surveying land, steps were often used to calculate.

Ruler, also known as ruler and interval ruler, is a tool for drawing line segments and measuring length. Legend has it that the ruler was invented by Lu Ban. ; One of Lu Ban's inventions is that he can correctly draw a right triangle, also called a class ruler, and can tell craftsmen which sizes are irregular, and according to the rules of divination. These rulers were bought today. There are usually scales on the ruler to measure the length.

1245, the bone ruler and ivory ruler unearthed from Yin Ruins in Anyang, Henan Province were the earliest, with the length of 16.9 and 15.8 cm respectively, carved into ten inches, with each inch carved into ten points, indicating that China adopted the advanced decimal system to record the length more than 3,000 years ago.

There are countless feet in the world, which vary from place to place and from person to person. The patriarch unified the village, the state officials unified the county, and Qin Shihuang unified China's weights and measures. Now rice comes from the sound and meaning of rice. Weights and measures are a system, and rulers are artificially made.