What’s the population density of the usa

Approximately 92.9 residents per square mile
In 2019, the population density was approximately 92.9 residents per square mile of land area. Population density has been tracked for over two hundred years in the United States. Over the last two centuries, the number of people living in the United States per square mile has grown from 4.5 in 1790 to 87.4 in 2010

H=   2(area/a+b)h= 2(144/a+b)h= 2(144/18+18)h= 2(144/36)h= 2(4)h=8