Assertion: icosahedron | /r/CreatedBy | its 12 vertices
Facets:
Source sentences:
text: Like the roofs of the dodecahedron, the set of 12 trajectories of the icosahedron corresponding to its 12 vertices can be decomposed into 3 reciprocally orthogonal rectangles (however, having a particular--"golden"--ratio of their sides' lengths for the star to be regular).