HELP!!!!!!!!!!!!! PPPPPPLLLLLLLLLLLLllZZZZZZZZZZZZZZZZZZZZ

Answer:
56.54866776
Step-by-step explanation:
To find the circumference multiply the diameter of the circle with π (pi) or multiply the radius 2x with pi (π=3.14).
So18x π= 56.54866776
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