oblique strophoid

This is a more general specimen of the right strophoid.

Now the line OO' through pole O and fixed point O' is no longer perpendicular to the construction line l.
The parameter a = P/2 for the right strophoid can now also have other values, in Cartesian coordinates:


The curve is a pedal of the parabola, and a special case of the general strophoid. Sometimes the oblique strophoid itself is called the 'general strophoid'.