Answer:
D. pi
Step-by-step explanation:
Circumference of a circle = 
Diameter = d
Therefore, ratio of circumference of a circle to its diameter would be:

=> (d cancels d)
Therefore, the ratio of the circumference of a circle to its diameter is 
Answer:i believe the answer is -54
Hope this helped!
Step-by-step explanation:
Answer:B
Step-by-step explanation:
60÷3
Because 60 minutes in one hour
60÷3=20
20×18=360