A diagram showing the approximation of the <a href="https://en.wikipedia.org/wiki/arc_length" class="extiw" title="en:arc length">arc length</a> of a small piece of the curve by using the <a href="https://en.wikipedia.org/wiki/pythagorean_theorem" class="extiw" title="en:pythagorean theorem">pythagorean theorem</a>.
<a href="//commons.wikimedia.org/wiki/User:NikNaks" title="User:NikNaks">NikNaks</a>
2013-04-12 18:11:57
<span class="int-own-work" lang="en">Own work</span>