A spherical model of planet Earth has a radius of 3 ft.
What is the approximate volume of the model of planet earth?
Use 3.14 to approximate pi. Round to the nearest hundredth if necessary.
Enter your answer as a decimal in the box.

Question

Lars · Answer

Is it 36.45? I don't really know honestly and it's getting stressful.

Shadow · Answer

$$V_{s} = \frac{ 4 }{ 3 } \pi r^3$$

Shadow · Answer

In words, the volume of a sphere is equal to four thirds of pi times the radius, squared.

So just add in the radius and then you can solve.

Shadow · Answer

Considering 3^3 is 27, I think 36.45 is unlikely, considering it still needs to be multiplied by pi (3.14) and 4/3

Lars · Answer

@shadow wrote:

In words, the volume of a sphere is equal to four thirds of pi times the radius, squared. So just add in the radius and then you can solve.

@shadow wrote:

Considering 3^3 is 27, I think 36.45 is unlikely, considering it still needs to be multiplied by pi (3.14) and 4/3

I'm confused, what am I adding the radius to? Which numbers?

Shadow · Answer

There is no addition happening here. You are simply doing exponents (3)^3 then multiplying the result by pi aka 3.14, then multiplying it by 4/3

Shadow · Answer

If you mean where are you submitting radius aka 3ft in for, you put it in where 'r' is, in the equation

Lars · Answer

So (3)^3 is 27 ?

Lars · Answer

Whoops it deleted the other part of my response,  how do i multiply 27 for pi (3.14) and 4/3

Lars · Answer

@shadow wrote:

If you mean where are you submitting radius aka 3ft in for, you put it in where 'r' is, in the equation

@lars wrote:

Whoops it deleted the other part of my response, how do i multiply 27 for pi (3.14) and 4/3

27 x (3.14) and 4/3 would be 86.113 ?

Lars · Answer

I get 113.04, is that right?

Shadow · Answer

Correct