Number of people / area = population density
Number of people/ population density = area
Replacing with the values given:
200,000 / area = 1650
Solving for the area:
200,000/1650 = area
121.12 km2 = area
since it's a square region:
Area of a square = Side length^2
Replacing with the values obtained:
121.12 = s^2
Solving for s (side)
√121.12 = s
s = 11 km
