The perimeter is the sum of all sides.
You can observe in the figure that one side length is missing, but we can find it by subtraction.
[tex]13yd-8yd=5yd[/tex]Once we have all side lengths, we can sum them.
[tex]\begin{gathered} P=13yd+6yd+8yd+9yd+5yd+15yd \\ P=56yd \end{gathered}[/tex]