Answer
$ 810^{\circ}$
Work Step by Step
In order to convert the value from radians to degrees, we multiply by $\dfrac{180^{\circ}}{\pi}$.
Therefore,
$\dfrac{9 \pi}{2 }\text{radians} \\=\dfrac{ 9\pi}{2} \times \dfrac{180^{\circ}}{\pi} = 810^{\circ}$
