Answer:
[tex]32.13km[/tex]
Step-by-step explanation:
First find the arc length of
[tex] \frac{90}{360} \times2 \pi r \\ \frac{1}{4} \times 3.14 \times 9 \times 2\\ = \frac{254.34}{4} \\ = 14.13km[/tex]
Now let's find the perimeter
[tex]perimeter = arc \: \: length + radius + radius \\ 14.13km + 9 + 9 \\ =32.13km [/tex]
