user: ### NOW ANSWER:
Question: What was the Area (km²) when the Population (2011) was 8574, and the Population density was larger than 381.4?
Columns: ['County', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Area (km²)', 'Population density']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Prince', 1135.0, 1081.0, 5.0, 4.5, 252.1]
SQL:

assistant: SELECT AVG("Area (km²)") FROM "Table" WHERE "Population (2011)" = 8574.0 AND "Population density" > 381.4;