There are less than 11 settlements in Kecamatan Bogor Tengah, what is the area in km²?
CREATE TABLE "districts_of_bogor_city" (
  "english_name" text,
  "original_name" text,
  "area_in_km" real,
  "population_at_2010_census" real,
  "number_of_settlements_and_villages" real
);
SELECT SUM("area_in_km") FROM "districts_of_bogor_city" WHERE "original_name"='kecamatan bogor tengah' AND "number_of_settlements_and_villages"<11;