The earth can be approximately a sphere with a radius of 6.37 * 10 to the third power (km). What is the volume of the earth The earth can be approximately regarded as a sphere with a radius of 6.37 * 10 cubic kilometers. What is the volume of the earth

The earth can be approximately a sphere with a radius of 6.37 * 10 to the third power (km). What is the volume of the earth The earth can be approximately regarded as a sphere with a radius of 6.37 * 10 cubic kilometers. What is the volume of the earth

V=（4/3）πR^3
=1082696932430 cubic kilometers

The earth can be approximately regarded as a sphere. If V and R are used to represent the volume and radius of the sphere respectively, then s = 4,
It is known that the radius of the earth is about 6 × 10 & # 179; km π R & # 178;, calculate the surface area of the earth, take π as 3.14, and keep three significant numbers

√ denotes the root sign
Use the first mathematical induction method: cut the upper hemisphere of a ball with radius r into N parts horizontally, each with equal height
And each cylinder is regarded as a cylinder, in which the radius is equal to the radius of its bottom circle
Then s (k) = 2 π R (k) × H
Where h = R / N, R (k) = √ [R ^ 2; - (KH ^ 2;]
S(k)=√[R^2;-(kR/n)^2;]×2πR/n 　　
=2πR^2;×√[1/n^2;-(k/n^2)^2;] 　　
Then s (1) + s (2) + +S (n) when n is infinite, the surface area of the hemisphere is 2 π R ^ 2
Multiplying by 2 is the surface area of the whole sphere 4 π R ^ 2;
The final result is 75.4 times 10 to the fifth power

If the volume formula of ball is 4 / 3 π r to the third power, the radius of ball a is r, and the radius of ball B is R + 1, how much more is the volume of ball B than that of ball a
In a hurry

4/3*pi*[(r+1)^3-r^3]