CREATE TABLE table_73800 ("City / Municipality" TEXT, "No. of s Barangay" FLOAT, "District" FLOAT, "Area  ( km\\u00b2 ) " TEXT, "Population  ( 2010 ) " FLOAT, "Income class  ( 2007 ) " TEXT, "ZIP code" FLOAT, "Mayor" TEXT)

What are all the vicinity (km ) where profits magnificence (2007) is 2nd
SELECT "Area (km\u00b2)" FROM table_73800 WHERE "Income class (2007)" = '2nd'
SELECT "Area (km\u00b2)" FROM "table_73800" WHERE "Income class (2007)" = '2nd'