Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1104312_5 (english_name VARCHAR, area_in_km² VARCHAR)

### Question ###
How many districts have an area of 17.72 KM2?

### Accurate SQL ###

SELECT COUNT(english_name) FROM table_1104312_5 WHERE area_in_km² = "17.72"