The answer would be 8 1/4 because if you have the opposite of the opposite you get what you started with. For example the opposite of night is day then the opposite of day is night so you end up with what you started with.
21,800,000 rounded to the nearest million = 22,000,000
The answer should be d
64pi=4pir^2
cancel the pi
64=4r^2
16=r^2
r=4
The formula is Opposite/Hypotenuse
