Place a chair facing where you want the center of the array to be.
select the chair
Multiply the chair using the criterion "rotate"
Click the the center of the array and drag in a circle. The chair copies will follow. You can also constrain the copies to make a complete circle without actually dragging around - the default.
You will notice that there is a "distribute -1" option. Use that to avoid making an overlapping extra chair.
Get some training. page 136 usa reference guide.
Dwight Atkinson
