The legend tells you the number of inches on a map.
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Scale
The map's scale
Divide by 36. That tells you how many yards. Divide the remainder by 12. That tells you how many feet. The final remainder tells you the number of inches.
It depends on the scale of the map.
A graphic scale is one type of map scale, which tells you how distance on the map compares to the actual distance across the land. Graphic scales show the scale as a line or a bar with the distance markings on them. Other types of map scales include numeric (such as 1:24,000 means one inch on the map represents 24,000 inches on land), or verbal (1 inch=1 mile).