What's rotational symmetry?
can u give a full on explanation?
pls

As of mid-2016, the world's population was about 7.4 billion people. the population of the united states was 324 million. the land area of a certain state is about 261,719 square miles. if in mid-2016 all of the world's people were put into that state, how many people would there be in each square mile? (round your answer to the nearest whole number.)