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Feature data

In geographic information systems, a feature comprises an entity with a geographic location, typically describable by (for example) points and/or arcs and/or polygons. Carriageways and cadastres[?] exemplify feature data.

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Quadratic formula

... a being non-zero. These solutions are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The ...