Aileen is decorating for the grand opening of the town's new courthouse. The entrance is marked by two stone columns that each stand 4.5 meters tall and a semicircular arch above the columns. She has a hung a 2-meter-long welcome banner between the two columns, and she wants to line the entrance with a garland. If the garland will cover the inside edge of the entrance, from the bottom of the columns to the top of the arch, how many meters of garland will Aileen need?