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*The [[involute]]s of a given curve are a set of parallel curves. For example: the involutes of a circle are parallel spirals (see diagram).
And:<ref name="farouki-slides">http://faculty.engineering.ucdavis.edu/farouki/wp-content/uploads/sites/41/2013/02/Introduction-to-PH-curves.pdf {{Webarchive|url=https://web.archive.org/web/20150605214546/http://faculty.engineering.ucdavis.edu/farouki/wp-content/uploads/sites/41/2013/02/Introduction-to-PH-curves.pdf |date=2015-06-05 }}, p. 16 "taxonomy of offset curves"</ref>
* A [[parabola]] has as (two-sided) offsets [[rational curve]]s of degree 6.
* A [[hyperbola]] or an [[ellipse]] has as (two-sided) offsets an [[algebraic curve]] of degree 8.
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