Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many districts have an area of 17.72 KM2?

### Inputs:
table_name: table, columns: ['English name', 'Original name', 'Area in km²', 'Population at 2010 Census', 'Number of settlements and villages']

### Response:
SELECT COUNT English name FROM table WHERE Area in km² = 17.72