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.
In some countries this may not be legally possible; if so: en:Michael Hardy grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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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.