To find the circumference of a circle, you can use the formula:
\[ C = 2 \pi r \]
where \(C\) is the circumference, \(r\) is the radius, and \(\pi\) is approximately 3.14.
Given that the radius \(r\) is 3 feet, we can substitute the values into the formula:
\[ C = 2 \times 3.14 \times 3 \]
Calculating this step-by-step:
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Calculate \(2 \times 3.14\): \[ 2 \times 3.14 = 6.28 \]
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Now multiply by the radius \(3\): \[ 6.28 \times 3 = 18.84 \]
So, the circumference of the circle is approximately:
\[ \boxed{18.84} \text{ feet} \]