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To use a ruler to measure a distance, one or more length scales are printed on the ruler. Rulers come in various sizes, lengths, and shapes. Many rulers come in the shape of a rectangle, usually with a length 3 to 15 times greater than its width. The ruler depicted below has a length 7 times greater than its width.
Sometimes, due to physical restrictions, it may be impossible to measure from 0 on the ruler. In such cases, the difference between two measures on the ruler can be calculated to find the distance between the points.