Answer:

Step-by-step explanation:
The ratio of a circumference to its diameter is equal to an irrational number, called pi, roughly equal to 3.14, denoted by symbol

Therefore, knowing the diameter d, the circumference is equal to d*π
Answer:
72.25663
Step-by-step explanation:
C=2πr=2·π·11.5≈72.25663
I was to tired to write it down
Answer:
7(100-1)
Step-by-step explanation:
That's it right there