non convex tetrahedral bowtie polyhedron featuring 4 reg hex and 12 reg pent with dodecahedra RobertLovesPi.net A Polyhedron Containing Twenty Regular Hexagons and Twenty Four Convex Pentagons RobertLovesPi.net Convex and Concave Hexagons Definition with Diagrams Irregular Convex Hexagon ClipArt ETC Concave vs Convex: What's the Difference?
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