CREATE TABLE table_64012 ("Serial No." FLOAT, "District" TEXT, "Headquartered City" TEXT, "City Population  ( 2009 ) " FLOAT, "City Area ( km 2  ) " FLOAT)

What district was the city with an area smaller than 12 square kilometers and a serial number of 35?
SELECT "District" FROM table_64012 WHERE "City Area(km 2 )" < '12' AND "Serial No." = '35'
SELECT "District" FROM "table_64012" WHERE "City Area(km 2 )" < '12' AND "Serial No." = '35'