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 "P"1 and "P"2 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 "P"1 and "P"2 is then the strophoid of C with respect to the pole "O" and fixed point "A". Note that "AP"1 and "AP"2 are at right angles in this construction.