What are the kinds of polygon with meaning?
Kinds of polygons with their meanings are: Convex (all diagonals
are internal), concave (at least one diagonal is outside the
shape), equilateral (equal sides), equiangular (equal angles),
regular (equal angles and sides), irregular, (no equal angles and
sides), triangle (3 sides), quadrilateral (4 sides), pentagon (5
sides), hexagon (6 sides), heptagon (7 sides), octagon (8 sides),
enneagon or nonagon (9 sides), decagon (10 sides), hendecagon (11
sides), dodecagon (12 sides), tridecagon or triskaidecagon (13
sides), tetradecagon or tetrakaidecago (14 sides), pendedecagon (15
sides), hexdecagon (16 sides), hepdecagon (17 sides), ocdecagon (18
sides), enneadecagon (19 sides) and icosagon (20 sides).