The garden is described as having a circular shape. The diameter is 9 feet. The length of fencing material needed to fence around the outside of her garden refers to the perimeter or the circumference of the circular garden.
The circumference of a circle is given as;
![\begin{gathered} \text{Cir}=2\pi r \\ r=\frac{\text{diameter}}{2} \\ r=4.5 \\ \text{Cir}=2*3.14*4.5 \\ \text{Cir}=28.26 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/cu2epi4bwehzwzvv86wtkidf93enghx4by.png)
Therefore, Rose would need 28.26 feet of fencing material