Catenary

http://pheeds.com/info/guide/c/ca/catenary.html

 

1. In mathematics, a catenary curve is the curve made by a chain suspended between two points, supporting a constant weight per length. It is the graph of:

 

y = cosh x 

This is not the same as the curve made by a chain supporting a constant weight per horizontal length, as in a suspension bridge; that is a parabola.

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