1) Five-sided 2) Having five corners or angles 3) Having five sides 4) Like many stars 5) Pentangular 6) Polygon 7) Polygonal shape Found on https://www.crosswordclues.com/clue/pentagonal
Pen·tag'o·nal adjective [ Confer French pentagonal , pentagone , Latin pentagonus , pentagonius , Greek ....] Having five corners or angles. Pentagonal dodecahedron . See Dodecahedron , and Pyritohedron . Found on http://www.encyclo.co.uk/webster/P/48