CREATE TABLE table_55397 ("English name" TEXT, "Original name" TEXT, "Area in km\\u00b2" FLOAT, "Population at 2010 Census" FLOAT, "Number of settlements and villages" FLOAT)

There are less than 11 settlements in Kecamatan Bogor Tengah, what is the area in km ?
SELECT SUM("Area in km\u00b2") FROM table_55397 WHERE "Original name" = 'kecamatan bogor tengah' AND "Number of settlements and villages" < '11'
SELECT SUM("Area in km\u00b2") FROM "table_55397" WHERE "Number of settlements and villages" < '11' AND "Original name" = 'kecamatan bogor tengah'