If a map has a line to describe a measurement, the method being used is the graphic or bar scale method. The bar method represents the measurement with a line and is separated by small intersecting lines. One side of the bar represents the distance on the map, while the other side shows the real distance of an object in real life. It is beneficial to use the bar method because it is an easy way to determine the scale or measurement, and it is also accurate because if a map is enlarged or reduced, so is the scale.
If you want to compute for the measurement using a bar scale, you can follow this example: If you are given a bar scale of 1 segment equals to 2 centimeters long and you measure the distance between two points on the map to be 20 cm, the distance on the ground will be: 20 cm divided by 200 m = 10 cm times 200 m = 2,000 kilometers as the total distance.
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