brainlist and 20 points

Answer:
C = 47.1
Step-by-step explanation:
It already gives you the circumference formula, so all you need to do is plug in the numbers given:
C = πd
The "d," in the formula stands for the diameter, which in this case, is already given to you as 15, so just plug 15 into the formula:
C = π(15)
C = 47.1