user: Question: What is the total number of areas by square mile where the founding year was 1785, the county seat was in spartanburg, and the land area by square mile was more than 811?
Columns: ['County', 'Year Founded', 'County Seat', '2010 Census Population', 'July 1, 2012 Population Estimate.', 'Area (Sq. Mi.)', 'Land Area (Sq. Mi.)']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Abbeville County', '1785', 'Abbeville', 25417.0, 25101.0, 511.0, 508.0]
SQL:

assistant: SELECT SUM("Area (Sq. Mi.)") FROM "Table" WHERE "Year Founded" = '1785' AND "County Seat" = 'spartanburg' AND "Land Area (Sq. Mi.)" > 811.0;