Historically they were mainly wooden but plastics have also been used since they were invented they can be molded with length markings instead of being scribed. Rulers have long been made from different materials and in multiple sizes. Since much technical work is now done on computer, many software programs implement virtual rulers to help the user estimate virtual distances. Rulers are ubiquitous in the engineering and construction industries, often in the form of a tape measure, and are used for making and reading technical drawings. At the high school level rulers are often used as straightedges for geometric constructions in Euclidean geometry. Children learn the basic use of rulers at the elementary school level, and they are often part of a student's school supplies. Their ability to quickly and easily measure lengths makes them important in the textile industry and in the retail trade, where lengths of string, fabric, and paper goods can be cut to size. They are important tools in the design and construction of buildings. They are commonly made from metal, wood, fabric, paper, and plastic. Rulers have been used since ancient times. Specialty rulers exist that have flexible edges that retain a chosen shape these find use in sewing, arts, and crafts. Some rulers, such as cloth or paper tape measures, are non-rigid. Commonly the instrument is rigid and the edge itself is a straightedge ("ruled straightedge"), which additionally allows one to draw straight lines.
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