A 300 sided polygon is known as a trictogon
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its a trioscentalogram
0.5*(1002-300) = 4850 diagonals
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon