Hi essimoon,
A parametric equation for a circle is:
Position = (UnitX * Radius * cosine(Theta)) + (UnitY * Radius * sine(Theta))
Where you vary Theta from 0 to 2*Pi radians (or 0 to 360 degrees).
UnitX and UnitY are the basis vectors of the plane you want the circle to be in (e.g., (1,0,0) and (0,1,0) if you want it in the XY plane).
Run a for loop for the number of objects you want to create and figure out what Theta should be for each one based on the total number (e.g., if you have 4 objects, you want 90 degrees between them, starting at 0).
Cheers,
Michael Noland