Suppose a wallpaper pattern with only a 180° rotation has reflection lines that always intersect at a rotational center. Use the flowchart in the textbook to find the standard notation for the pattern.
A) pmm
B) cmm
C) pmg
D) p2

Question

Quizplus · Accepted Answer

The presence of both 180° rotation and reflection lines that intersect at the rotational center indicates a pmm pattern, which is characterized by reflections in two different directions and a 180° rotation symmetry.

Suppose a Wallpaper Pattern with Only a 180° Rotation Has