Scale = distance on map/actual distance

There are usually three forms of scale:

(1) number, which indicates the scale size by proportion or fraction. For example, 1 cm on the map represents a field distance of 500 kilometers, which can be written as:1:50,000,000 or1/50,000,000. (Figure 1 and Figure 2 of this problem)

(2) Line segment type: Draw a line segment on the map and indicate the actual distance represented by 1 cm on the map. (Figure 3 of this question)

(3) Mainly written in words, directly write down 1 cm on the map to indicate how many kilometers the actual distance is. For example, 1 cm on the map is equivalent to 500 kilometers on the ground, or one in 50 million.

First picture

6÷1/2000000 = 1200000 (cm) =120 (km)

Second picture

6÷1/300000 = 1800000 (cm) =180 (km)

The third picture

15× 6 = 90km