Tetrachloroethylene (data page)

Bifolium for $a=1.$

For the brachiopod genus, see Bifolium (brachiopod).

The bifolium is a quartic plane curve of the equation:

$(x^2+y^2{)}^2=a{x}^{2}y.$

In polar coordinates, its equation is

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

External links

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