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polygons 3-20, diagonal rule
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has all the polygons from 3-20, has the rule to get diagonals
Terms in this set (20)
triangle
3 sided polygon
quadrilateral
4 sided polygon
pentagon
5 sided polygon
hexagon
6 sided polygon
septagon
7 sided polygon (starts with s)
heptagon
7 sided polygon (starts with h)
octagon
8 sided polygon
nonagon
9 sided polygon
decagon
10 sided polygon
hendecagon
11 sided polygon
dodecagon
12 sided polygon
triskaidecagon
13 sided polygon
tetrakaidecagon
14 sided polygon
pentakaidecagon
15 sided polygon
hexakaidecagon
16 sided polygon
heptakaidecagon
17 sided polygon
octakaidecagon
18 sided polygon
eneeakaidecagon
19 sided polygon
icosagon
20 sided polygon
(n(n-3))/2
how to get diagonals
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