Tangent on a Logarithmic Spiral

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The logarithmic spiral has the property that the angle (say ) between a radius vector to a point on the curve and the tangent at the point is a constant, namely .

Contributed by: Izidor Hafner (December 2012)
Open content licensed under CC BY-NC-SA




[1] V. I. Smirnoff, Lectures in Higher Mathematics (in Russian), Vol. 1, Moscow: Nauka Publishers, 1967, pp. 222–223.

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