Assertion: polyhedron's vertex | /r/CapableOf | line up in plane
Facets:
Source sentences:
text: The difference between the prismatic and antiprismatic symmetry groups is that D ph has the vertices lined up in both planes, which gives it a reflection plane perpendicular to its p-fold axis (parallel to the {p/q} polygon); while D pd has the vertices twisted relative to the other plane, which gives it a rotatory reflection.