CREATE TABLE table_8972 ("Name" TEXT, "Seat" TEXT, "Population  ( 2011 ) " FLOAT, "Area  ( km 2  ) " FLOAT, "Density  ( inhabitants/km 2  ) " FLOAT)

What is the area (in km2) for theewaterskloof, whose population in 2011 was less than 108,790?
SELECT SUM("Area (km 2 )") FROM table_8972 WHERE "Name" = 'theewaterskloof' AND "Population (2011)" < '108,790'
SELECT SUM("Area (km 2 )") FROM "table_8972" WHERE "Name" = 'theewaterskloof' AND "Population (2011)" < '108,790'