To calculate the circumference of a circle using its radius you have to calculate twice its radius multiplied by pi, following the formula:
[tex]C=2\pi r[/tex]The given radius has a radius of r=9m, you can calculate the circumference as:
[tex]\begin{gathered} C=2\pi9 \\ C=(2\cdot9)\pi \\ C=18\pi \\ C\approx56.55m \end{gathered}[/tex]The circumference of the circle is 18π m or aproximatelly 56.55m
