Abstract
In this article, we present purely geometrical proofs of the well-known properties of the lemniscate of Bernoulli.
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http://xahlee.info/SpecialPlaneCurves_dir/LemniscateOfBernoulli_dir/lemniscateOfBernoulli.html.
R. A. Johnson. Advanced Euclidean Geometry. Dover Publications, New York, N.Y., 2007.
J. D. Lawrence. A catalog of special plane curves. Dover Publications, New York, N.Y., 1972.
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Akopyan, A.V. The Lemniscate of Bernoulli, Without Formulas. Math Intelligencer 36, 47–50 (2014). https://doi.org/10.1007/s00283-014-9445-5
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DOI: https://doi.org/10.1007/s00283-014-9445-5