12 bricks in a circle will give you an inside diameter of approximately 30 inches
Using 12 stones in a circle, this inside diameter is approximately 30-31 inches
I used these to create fire pit as the fire pit pavers were sold out. 12 each row and 5 rows for a total of 60 clocks is what i used. Worked out to a 33 inch outside diameter fire pit.
I didn't use mortar or brick glue, but you certainly could!
Not that I'm aware of. However, each brick has a smooth side and a rough side.
I used 12 for each level
12 for each row worked great to create fire pit