Assertion: regular polygon | /r/HasProperty | known to ancient greeks
Facets:
value: with the pentagram
type: OTHER
Source sentences:
text: The regular polygons were known to the ancient Greeks, with the pentagram, a non-convex regular polygon (star polygon), appearing as early as the 7th century B.C. on a krater by Aristophanes, found at Caere and now in the Capitoline Museum.