The area of a circle is:
A=πr²
In order to find the radius from the diameter, divide the diameter by 2. This makes the radius 16.5. You can then plug those numbers into the formula.
A=π(16.5)²
A=π(272.25)
A=(3.14)(272.25)
A=854.865
If you round this number, it then brings the area of the circle to 854.87 yards. I hope this helped.