Hi, thak you. I get the following: > > > *** Error message ************* > > > Traceback (most recent call last): > > File "C:/Python25/z - MIS PROGRAMAS/volumen-b.py", line 20, > > in > > <module> > > main() > > File "C:/Python25/z - MIS PROGRAMAS/volumen-b.py", line 13, > > in main > > volume = 4/3*pi*r3 > > NameError: global name 'pi' is not defined
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