The circumference of a circle is given by the following formula:
[tex]C=2\pi r[/tex]
Where r is the radius of the circle.
This circle has a radius of 13, then the circumference is:
[tex]\begin{gathered} C=2\cdot3\cdot13 \\ C=78 \end{gathered}[/tex]
The circumference of this circle is 78.
