The size of the earth is about 182 billion cubic kilometers, the area is about 5 1 1934 square kilometers, the equatorial radius of the earth is 6378. 14 kilometers, and the equatorial circumference is 475 kilometers.

Understanding the basic shape and size of the earth is of great practical significance in production and scientific research. For example, in the application of space technology, determine the flight orbits of missiles and artificial satellites, understand the internal structure of the earth and some physical phenomena on the surface of the earth, as well as astrophysical research. , we must master all kinds of accurate values of the earth.