In geometry, a strophoid is a curve generated from a given curve C and points A (the fixed point) and O (the pole) as follows: Let L be a variable line passing through O and intersecting C at K. Now let P1 and P2 be the two points on L whose distance from K is the same as the distance from A to K. The locus of such points P1 and P2 is then the str...
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http://en.wikipedia.org/wiki/Strophoid
A looping curve, first studied in 1670 by Isaac Barrow (1630-1677), the first Lucasian Professor of Mathematics at Cambridge and the immediate predecessor of Isaac Newton in this job. The strophoid, which is a special case of the general cissoid, was named by Montucci in 1846 from the Latin for 'twi...
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http://www.daviddarling.info/encyclopedia/S/strophoid.html
a plane curve generated by the loci of points p and pprime; on a straight line that intersects the y-axis at a point n and the minus x-axis at a fixed point q, such that pn = npprime; = on, as on changes, where o is the origin. Equation: = x(x+a)/(a−x). y
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https://www.infoplease.com/dictionary/strophoid
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