Cissoid of Diocles

Diocles is another who has not produced his best over fences yet but he has still performed with credit and has time on his side. Said to be secundus aetate famaque with respect to a cubic plane curve, Diocles is notable for the property that it can be used to construct two mean proportionals to a given ratio of a parabola vertex.

Cissoid is the locus of all points.