What is the formula for the volume of a sphere

What is the formula for the volume of a sphere

When I was in high school, I used the Zu principle
The center of a cylinder with the bottom radius R and height R is cut out of a circular cone with the same bottom and height. The remaining part is equal to the area of a hemisphere when it is cut by a plane. The conclusion is that they are equal in volume. The volume of the excavated body is easy to find. It is the volume of the hemisphere. V = 2 / 3 π R ^ 3. Therefore, the volume of a whole sphere is 4 / 3 π R ^ 3