Final answer:
To find the population density in people per square mile, divide the population by the area. Calculate the area using the formula for the area of a circle and plug in the values to find the population density.
Step-by-step explanation:
The population density can be calculated by dividing the population by the area. To find the population density in people per square mile, we can use the formula:
Population density = Population / Area
In this case, the population is 210,000 and the area can be calculated using the formula for the area of a circle:
Area = pi x radius^2
Plugging in the values, we get:
Area = 3.14 x 12^2 = 452.16 square miles
Now we can calculate the population density:
Population density = 210,000 / 452.16 = 464.32 people per square mile