The meaning of scale is that the ratio of the distance on a picture to the actual distance is called the scale of this picture.

Distance on the map: actual distance = scale

There are three forms of scale, namely ratio form, fraction form and line segment scale (on the map, mark 1cm on a line segment to indicate how many meters or all kilometers).

This map is a miniature map. The map scale with a scale less than 1 is generally written as 1 (for example, 1: 100000). Or the molecule is a fraction of 1 (for example,11000000). The scales of 1: 100000 and 1100000 are both1cm.

The drawing scale of precision parts is generally enlarged, and its ratio is greater than 1, and the latter item is generally written as the ratio of 1. If the scale is 20: 1, it means that 20 cm on the map represents the actual 1 cm.