This tool is accessible via main menu > Build in selection / transformation mode.
Auto Repeat ... command opens window with options to duplicate selected objects along line, around the circle or rectangle, or to fill rectangular area. It is possible to set distance (gap) between the objects.
When using a line, it is also possible to set angle of this line.
You can also choose if you want to preserve orientation of the objects or if you want to mirror them vertically and horizontally and rotate them to be parallel to the baseline.
In this example the triangle at top was auto-repeated 8 times around the circle. Duplicates were transformed to be parallel to the baseline (i.e. circle).