''Oncidium bifolium'' is a species of
orchid ranging from
Brazil to northern
Argentina.
References
External links
bifolium
A bifolium is a quartic plane curve with equation in Cartesian coordinates:
:(x^2 + y^2)^2 = ax^2y.
Construction and equations
Given a circle C through a point O, and line L tangent to the circle at point O: for each point Q on C, define ...
Orchids of Argentina
Orchids of Brazil
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