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triangulation (surveying)
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Triangulation (surveying)
Technique used in surveying to determine distances, using the properties of the triangle. To begin, surveyors measure a certain length exactly to provide a base line. From each end of this line they then measure the angle to a distant point, using a theodolite. They now have a triangle in which they know the length of one side and the two adjacent angles. By simple trigonometry they can work out the lengths of the other two sides.
To make a complete survey of the region, they repeat the process, building on the first triangle.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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