Start with any size polygon, it doesn’t matter as you will resize it later after the array of circles.

The number of sides for the circle has to be a multiple of the sides of the polygon, as shown previously by Jimhami42. For example for a 5 sided polygon use a circle of 30 sides. Just make sure to get the circle endpoint onto the midpoint of the polygon to get the array right.

When you have 5 circles in position, they will need to be resized to your intended diameter. I used the Tape Measure tool as shown below. Click on the endpoint once, then the opposite endpoint, type in the desired diameter and hit Enter and then confirm the resize. Then Zoom extents to bring the entities back to fill the screen. Check the diameter with the tape measure tool and it should measure correctly.

There is a bit of a trick to the other layers because of this way resizing. I could explain that later, I’m in a bit of a hurry right now.

I’m not quite sure what’s happening there, it could be a few things. Make sure you group the polygon, then make the first circle a component. Make sure only the circle component is selected, then do the copy rotate and make sure you hit the CTRL key when starting the rotation.

Hope this helps.