Logarithmic spiral

a spiral curve such that radii drawn from its pole or eye at equal angles with each other are in continual proportion. See Spiral.

logarithmic spiral

[′läg·ə‚rith·mik ′spī·rəl] (mathematics) The spiral plane curve whose points in polar coordinates (r,θ) satisfy the equation log r = a θ. Also known as equiangular spiral.

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