what is the number of area where the county is marsabit?
CREATE TABLE table_912 (
    "Code" real,
    "County" text,
    "Former Province" text,
    "Area (km 2 )" text,
    "Population Census 2009" real,
    "Capital" text
)
SELECT COUNT("Area (km 2 )") FROM table_912 WHERE "County" = 'Marsabit'
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 is the number of area where the county is marsabit? ### Input: CREATE TABLE table_912 (
    "Code" real,
    "County" text,
    "Former Province" text,
    "Area (km 2 )" text,
    "Population Census 2009" real,
    "Capital" text
) ### Response: SELECT COUNT("Area (km 2 )") FROM table_912 WHERE "County" = 'Marsabit'