This image was taken from the wikipedia in english here (http://en.wikipedia.org/wiki/Image:Arclength.png). The author released it for public domain and granted permission to use it for any reason whatsoever.
Nalgúns países, isto pode non ser legalmente posible; entón: en:Michael Hardy concede a calquera o dereito de empregar esta obra para o propósito que considere oportuno, sen condicións, agás aquelas que sexan requiridas pola lei.
Pés de foto
Engada unha explicación dunha liña do representa este ficheiro
This image was taken from the wikipedia in english here (http://en.wikipedia.org/wiki/Image:Arclength.png). The author released it for public domain and granted permission to use it for any reason whatsoever.