Bifolium

For the brachiopod genus, see Bifolium (brachiopod).

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

In polar coordinates, its equation is

$rho\; =\; a\; sintheta\; ,\; cos^2theta.$

External links

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