Fermat's spiral

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Fermat's spiral

[fer′mäz ‚spī·rəl]
(mathematics)
A plane curve whose equation in polar coordinates (r,θ) is r 2= a 2θ, where a is a constant.
References in periodicals archive ?
Mitsos and his colleagues recommend angling the heliostats at 137 degrees relative to each other in a parabolic pattern called the "Fermat spiral" after the 17th Century French mathematician Pierre de Fermat.