If a circle has a radius of 18 feet, what’s the closest approximation for circumference?

113 feet

Explanation

The formula for figuring circumference of a circle is: \(\text { Circumference }=\text { pi } \times \text { diameter }\). Diameter = 2r (radius). If we know the radius is 18 feet then Diameter = 18(2)or 36 feet. Therefore, the circumference formula would be: \(C=3.14(\pi) \times 36 \mathrm{ft}=113 \text { feet }\)

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