Well, first you should know the formula for finding the full distance around a circle. The distance is also known as the circumference C:
C = 2πr
where r is the radius which is half of the diameter. since we know the diameter, then we have enough information to solve for this:
C = 2π(64/2) m
C = 2π(32) m
C = 64π m
C ≈ 200.96 m
Now you might choose this as the answer, but the problem asks for half of the distance around the circle which is half of the circumference:
1/2C = 200.96/2
1/2C = 100.48
Thus the answer is A. 100.48.
