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Please Excuse me If I asked a Silly question : When to Set A Geographic coordinate system or projected coordinate system to a Shapefile?

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marked as duplicate by PolyGeo, iant Nov 12 '13 at 12:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
This looks like two questions so to fit the Q&A format of GIS-SE would you be able to focus this Question on the one you would like answered first, please? –  PolyGeo Nov 12 '13 at 11:29
    
@PolyGeo kindly give me the answer to the first question I have posted. –  Arun Nov 12 '13 at 11:35
    
This looks like you are trying to re-use a closed Question for a new one. I recommend that this one is rolled back and remains closed (as a duplicate) and that a second Question be asked with considerably more detail about what exactly is being asked. –  PolyGeo Nov 13 '13 at 4:33