**Curve - Wikipedia**
https://en.wikipedia.org/wiki/Arc_(geometry)

In mathematics, a curve (also called a curved line in older texts) is an object similar to a line, but that does not have to be straight.. Intuitively, a curve may be thought of as the trace left by a moving point.This is the definition that appeared more than 2000 years ago in Euclid's Elements: "The [curved] line is […] the first species of quantity, which has only one dimension, namely ...

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