A circle has a radius of 9. What is the exact circumference?

56.52

Step-by-step explanation:

To find circumference you need the formula C=Pi times the diameter to find the diameter you multiply the radius by two and then you multiply that answer by pi or 3.14 and you get  the answer 56.52

18π or 56.54866776 (exact)

Step-by-step explanation: Use the equation C = 2πr

Substitute in your values

C = 2π x 9 (use pi unless told otherwise)

2π = 6.283185307

6.283185307 x 9 = 56.54866776

or

If you are supposed to keep in terms of pi:

2π x 9 = 18π

C = 56.54866776 or 18π

Hope this helps

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