Bug fixed in 10.0.0+2014080602
I have Mathematica 10 on the Raspberry Pi. (wolfram-engine version 10.0.0+2013112003)
According to the "What's New in Mathematica 10" page http://www.wolfram.com/mathematica/new-in-10/symbolic-geometry/compute-measures-length-area-volume-etc.html , I should be able to say:
In[1]:= ArcLength[Circle[]]
Out[1]= 2π
What I actually see is:
In[1]:= ArcLength[Circle[]]
Out[1]= ArcLength[Circle[{0, 0}]]
and similarly for all other geometric examples on that page. Is this a Mathematica bug, or a Raspberry Pi bug, or a my understanding bug?