Answer:
58
Step-by-step explanation:
I think
Act like it's a whole circle and find the perimeter, then divide by 2.
P = 2 * pi * r
P = 2 * 3.14 * 9
P = 56.52
Now divide by 2:
P = 28.26
D. data collection
Simply the act of collecting data from sample
this is what would make sence for me
the frist one was confusing