As an extension to what Cherryman described, you also use the replicate function and set the rotation around the pivot center  for each object and the number of objects in one quick step to evenly distribute the objects around your circle (rather than click and drag...). For example, 3 additional copies offset at 90 degree around z will give you four objects arranged in a circle, 7 additional ones at 45 degree give you a total of eight and so on...

Ciao
TD