Geometry: Common Core (15th Edition)

$C=\frac{1}{2}\pi$ m
The formula for the circumference of a circle is $C=2\pi r$ The circle shown has a radius of $\frac{1}{4}$ m. We plug this value into the formula and simplify: $$C=2π\times\frac{1}{4}=\frac{1}{2}π$$ The problem tells us to leave the answer in terms of $π$.