human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: County, Population (2011), Population (2006), Change (%), Area (km²), Population density
###Question: What was the Area (km²) when the Population (2011) was 8574, and the Population density was larger than 381.4?
gpt
SELECT AVG Area (km²) FROM table WHERE Population (2011) = 8574 AND Population density > 381.4