Which of the following is the tool that cartographers use to show a ratio between distance on a map and the distance places actually are between one another?

The tool that cartographers use to show the ratio between distance on a map and the actual distance between places is called a scale. A map scale can be represented in various forms, such as a graphic scale (a line marked with distances), a numerical ratio (for example, 1:50,000), or a verbal scale (like "1 inch equals 1 mile").