Question

The mean radius of earth is 6,371.0 kilometers and the mean radius of earths moon is 1,737.5 kilometers. What is the approximate difference in the mean conferences, in kilometers, of earth and earths moon? Round your answer to the nearest tenth of a kilometer.

Answer 1

We calculate for the circumferences of Earth and moon by using the equation,
                                C = 2πr
For Earth,
                                C = 2π(6371 km) = 40030.2 km
For Moon,
                               C = 2π(1737.5 km) = 10917.0 km
The difference between the two circumferences is 29113.2 km approximately.