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Hi Lakshman - There is no way to calculate the area of geographic polygons for a shapefile directly in Tableau as part of a calculated field, but since it sounds like you have the original data source as a shapefile, it would be easy to add that calculation to the shapefile attributes using software like QGIS
There are some instructions on how to do this in QGIS on this page here: shapefile - Calculating polygon areas in QGIS? - Geographic Information Systems Stack Exchange
If your data were in a spatial database (e.g., SQL Server) you would be able to use the RAWSQL functionality in the calculated field to do the calculations - though those still aren't being natively done in Tableau, they are passing the SQL query for the calculation to the database.