Math Question, help please

Answer: 254.34 yd
Step-by-step explanation:
If the diameter is 18 yd then the radius:
radius = diameter/2
r = 18/2
r = 9 yd
So the area is:
[tex]A = \pi r^2\\= \pi (9)^2\\= (3.14)(81)\\ =254.34 \hspace2yd[/tex]
Therefore, the area of the circle is 254.34 yd