When encountering the external angle, the joint of the tiles on both sides is 45 degrees when the workers polish. After pasting, the two tiles form a 90-degree right angle, leaving only a small seam.
When you meet the inner corner, just press one side. The gap is still small.
Under special circumstances, the outer corner can be rounded, and a small piece of arc porcelain needs to be stuck at the right angle to form a rounded corner.