The volume of Earth is .
To solve, you must remember that to find the area of a circle, (includes volume since circle volume and area is same) you must do A=πr².
So, A=π3958.75²
How did we get 3958.75? Well, to find the area, you must multiply r by r (radius).
So, 3958.75² is 15671701.5625.
15671701.5625π