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

### Instruction:
What is the area of the city with a density of 8,546.1?

### Inputs:
table_name: table, columns: ['City district', 'Area km²', 'Population 2007 census(hab)', 'Housing (2007)', 'Density (hab/km²)', 'Elevation msl']

### Response:
SELECT Area km² FROM table WHERE Density (hab/km²) = 8,546.1