AutoCAD 2005 and earlier doesn’t have a way to dimension arc length, but Leonid Nemirovsky has come up with an AutoLISP routine that dimensions arc lengths very nicely. You can download it here.
Here’s the result:

Leonid has many, many more AutoLISP routines on his site, Better Than Nothing AutoLISP.
AutoCAD 2006 and later has this feature. Use the DIMARC command.
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