Answer:
The second one and the forth one.
The second one because it is true that half of the diameter is the radius.
The forth one because is you do 2 x pi x 31.4 = 197.29 divide that by pi and you get 62.8 pi.
The only reason it is not the third one is because it does not have the step to divide 197.29 by pi.
Hope this Helps!!
Step-by-step explanation:
ur welcome
