Assertion: polyhedron's triangle | /r/AtLocation | opposite sides of a square
Facets:
Source sentences:
text: The rest of the nomenclature used in the context of Johnson solids, is best described in the words of Norman W. Johnson himself: If we define a lune as a complex of two triangles attached to opposite sides of a square, the prefix spheno- refers to a wedgelike complex formed by two adjacent lunes.