Tetrachloroethylene (data page)

Bifolium for $a=1.$

For the brachiopod genus, see Bifolium (brachiopod).

The bifolium is a quartic plane curve of the equation:

$(x^{2}+y^{2})^{2}=ax^{2}y.\,$

In polar coordinates, its equation is

$\rho =a\sin \theta \,\cos ^{2}\theta .$

External links

• http://www.geom.uiuc.edu/~fjw/pisces/docs/models/Bifolium.html
• Bifolium at MathWorld