henagon
exterior angle
digon
bigon
reentrant polygon
reentering polygon
octagon
isogon
pentagon
interior angle
heptagon
internal angle
septagon
decagon
hexagon
hendecagon
megagon
regular polygon
undecagon
quadrilateral
tetradecagon
triangle
tetrakaidecagon
polygonal
tetracontagon
nonagon
icositrigon
chiliagon
quadrangle
octacontagon
heptadecagon
tetragon
dihectagon
hectogon
hexacontagon
kilogon
hexadecagon
icosihenagon
external angle
dodecagon
octadecagon
hexahectaenneacontakaiheptagon
triacontakaitetragon
triacontatetragon
pentacontagon
enneadecagon
polyangle
icositetragon
icosikaidigon
icosidigon