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The circumference is equal to r2*pie or 38.5 inches

Another answer:

Circumference of a circle = 2*pi*radius or pi*diameter

Circumference = 7*pi = 21.99114858 or 22.0 inches to one decimal place.

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Q: What is the circumference of a circle if it's diameter is 7 inches to 1 decimal place?
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