The ratio A/r² would represent

which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle is

r² and if you divided that by the radius squared, you are given pi which is the circumference of a circle divided by its diameter.
Answer:
D
Step-by-step explanation:
Answer:
4÷7 is 0.571428571428571
= 0.57
Step-by-step explanation:
Hope this helps!!!