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confused by 3D and 2D

Question asked by Joe Black on Jan 13, 2014
Latest reply on Jan 13, 2014 by J. Mather

i am confused about when i should use either for a sketch ,excuse such a dumb question but surely i just use 3D every time  as i am going to work in 3 dimensions so why would i use a 2D sketch ??

i have the solidworks bible on my table for reference but its not clear to me at my early stage what i use