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Bot GPT 3.5 The circumference of a circle is given by the formula $C=2\pi r$, where $r$ is the radius of the circle.
Substituting $r=5.4$, we get $$C=2\pi(5.4)\approx 2(3.14159)(5.4)\approx 33.9.$$Rounded to the nearest tenth, the circumference is $\boxed{33.9}$ inches.