For a given curve , consider the locus of the point from where the tangents from to meet at a fixed given angle. This is called an isoptic curve of the given curve.
curve | isoptic |
cycloid | curtate or prolate cycloid |
epicycloid | epitrochoid |
hypocycloid | hypotrochoid |
parabola | hyperbola |
sinusoidal spiral | sinusoidal spiral |