Question: What is a facet of a polytype of 600-cell with an equilateral triangle base?
Paraphrase: What may be a aspect of a polytype of 600-cell with an equilateral triangle base?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q2610844 wdt:P1312 ?answer . ?answer wdt:P3263 wd:Q157002}
Answer: regular tetrahedron