The circumference of a circle is given by the formula:
[tex]C=2\pi r[/tex]
Where r is the radius of the circle.
In the figure, we can see that the value of the radius is 11, by replacing it in the formula we can solve for C:
[tex]\begin{gathered} C=2\pi(11) \\ C=2\cdot3\cdot11 \\ C=66 \end{gathered}[/tex]
The circumference of this circle is 66.
