Answer:
56.52 mm.
Explanation:
For a circle of diameter, d
[tex]\text{Circumference}=\pi d[/tex]Substituting the given values, we have:
[tex]\begin{gathered} C=3.14\times18 \\ C=56.52\operatorname{mm} \end{gathered}[/tex]The circumference of the circle is 56.52 mm.
