Question 166066
The formula to use is:

V = (4/3)pi(r^2), where V = volume measured in cubic units, pi = 3.14 and 
r = radius of 4 meters.

We plug and chug:

V = (4/3)(3.14)(4^2)

V = (4/3) times (3.14) times (16)

V = 66.99 meters^3

Did you follow?

NOTE:  I rounded to two decimal places.