For Exercises 52–57, refer to the following. In Chapter 20, we study both repeating and nonrepeating plane patterns, from the point of view of their basic building blocks (tiles). Here, we ask you to analyze the repeating patterns from figures in that chapter according to wallpaper type, using the flowchart of Spotlight 19.9 (page 797). Identify all the symmetries and give the notational type for the wallpaper pattern of the illustrations that follow.

Question 19.83

image 53.Figure 20.11 (page 838)

53.

, if color is disregarded; otherwise, .