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19 terms

polygon names

STUDY
PLAY
3
triangle/trigon
4
quadrilateral/tetragon
5
pentagon
6
hexagon
7
heptagon (septagon)
8
octagon
9
enneagon (nonagon)
10
decagon
11
hendecagon
12
dodecagon
13
tridecagon
14
tetradecagon
15
pentadecagon/pendedecagon
16
hexdecagon
17
heptdecagon
18
octdecagon
19
enneadecagon
20
icosagon
Nathaniel...
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