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infiniteImproved Answer:-The formula is: 0.5*(n2-3n) where n is the number of sides of the polygonSo: 0.5*(144-36) = 54 diagonals
The name of a 12 sided polygon is Dodecagon.
it's a 12 sided shape and it has 54 diagonals :D
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon