Arc length dimensions appear as degrees

When I dimension an arc length in a drawing the dimension turns into a degree (and not the correct one).  I have tried selecting the end points then the arc and selecting the arc then the end points and I get the same effect.  On my sketches I get the expected dimension of an arc length.  This doesn't seem to be a document property problem.  If it is I don't know which one.

Anybody got a solution?

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