user: Question: What's the total area in kilometers of the parish addington?
Columns: ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Addington', 'Parish', 1024.99, 2727.0, '1,064 of 5,008']
SQL:

assistant: SELECT SUM("Area km 2") FROM "Table" WHERE "Official Name" = 'addington';