A statement of scale is typically used on a map. The statement of scale defines a ratio or relationship between a unit of length on the map and the piece of Earth being referenced in the map.
Know MoreAccording to the Intergovernmental Committee on Surveying and Mapping, scale defines a mathematical relationship between a map's size and the size of the piece of Earth that is being described. A statement of scale used as an example is 1:100,000, which means that every one unit on the map corresponds to 100,000 units on the Earth. For example, one centimeter on the map equals 100,000 centimeters, or one kilometer, on the Earth.
According to Science Encyclopedia, a statement of scale may also use a verbal relationship rather than a numeric ratio. For example, a map may show a verbal relationship of "one inch equals one mile" for its scale rather than providing a numeric ratio of 1 inch:63,360 inches to reflect the same. There are 63,360 inches in a mile.
Learn more about Data GraphsRows and columns are used to describe the arrangement of sets of data or objects in space, but the difference between these two terms lies is the orientation of the objects. A row has the objects arranged horizontally, and a column has the objects arranged vertically.
Full Answer >Primary keys are used to uniquely identify a row in a database table; no two rows can have the same primary key. Identification numbers are often used as primary keys. Any field that is not necessarily unique, such as a person's name, is not suitable for being a primary key.
Full Answer >In the real world, graphs are used to help people quickly understand and use information. Examples include graphs used in medicine and in business.
Full Answer >Several types of graphs are used for displaying information in mathematics including the bar graph; pie chart or circle graph; histogram; stem and leaf plot; dot plot; scatter plot; and time-series graphs. The type of graph chosen depends on whether the data is quantitative, qualitative or paired.
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