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conchoid
Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point…
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noun
Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts).
“If you consider a point on a radius of the rolling curve in generating a cardioid that is not on its circumference, the result is a conchoid called the limaçon of Pascal.”
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If you consider a point on a radius of the rolling curve in generating a cardioid that is not on its circumference, the result is a conchoid called the limaçon of Pascal.