SELECT SUM("Area (km\u00b2)") FROM table_6293 WHERE "County" = 'nairnshire' AND "Population" < '11,050'
What is the area (km ) of Nairnshire county, which has a population less than 11,050?
CREATE TABLE table_6293 (
    "County" text,
    "Area (acres)" text,
    "Area (km\u00b2)" real,
    "Population" real,
    "Population Density (per km 2 )" real
)