What are all the vicinity (km ) where profits magnificence (2007) is 2nd
CREATE TABLE table_73800 (
    "City / Municipality" text,
    "No. of s Barangay" real,
    "District" real,
    "Area (km\u00b2)" text,
    "Population (2010)" real,
    "Income class (2007)" text,
    "ZIP code" real,
    "Mayor" text
)
SELECT "Area (km\u00b2)" FROM table_73800 WHERE "Income class (2007)" = '2nd'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What are all the vicinity (km ) where profits magnificence (2007) is 2nd ### Input: CREATE TABLE table_73800 (
    "City / Municipality" text,
    "No. of s Barangay" real,
    "District" real,
    "Area (km\u00b2)" text,
    "Population (2010)" real,
    "Income class (2007)" text,
    "ZIP code" real,
    "Mayor" text
) ### Response: SELECT "Area (km\u00b2)" FROM table_73800 WHERE "Income class (2007)" = '2nd'