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Euclid (fl. c. 300 bc) Greek mathematician


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Defined in Euclid as a length without breadth. It is usually taken to refer to a curve, and the term ‘straight line’ used where appropriate. However, where no ambiguity results, the word straight is omitted. Similarly, a line is usually taken as extending indefinitely in both directions, and the term ‘line segment’ is used to specify the part of a line joining two points.

Subjects: Mathematics.

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