## Trifolium

Lawrence (1972) defines a trifolium as a Folium with . However, the term the'' trifolium is sometimes applied to the Folium with , which is then the 3-petalled Rose with Cartesian equation

and polar equation

The trifolium with is the Radial Curve of the Deltoid.

MacTutor History of Mathematics Archive. Trifolium.'' http://www-groups.dcs.st-and.ac.uk/~history/Curves/Trifolium.html.