Question

About 1.15 million people live in a circular region with a population density of about 18,075 people per square kilometer. Find the radius of the region. Round your answer to the nearest tenth.

Answer 1

Step 1

Find the total area

Total area=(1,150,000/18,075)=63.62 square kilometer

The area of a circle is equal to

$A=\pi * r^{2} \\ 63.62= \pi * r^{2}\\r=\sqrt{(63.62/\pi)} \\r=4.5\ km$

therefore

the answer is

$4.5\ km$