Archimedean spiral A curve whose equation in polar coordinates is r = aθ, where a ( > 0) is a constant. In the figure, |OA| = aπ, |OB| =2aπ, and so |OB| = 2|OA|. Compare equiangular spiral.
Archimedean spiral
http://www.mathematische-basteleien.de/spiral.htm
• An animation showing the Archimedean spiral.
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