The formula for finding the amount of diagonals in a polygon is n(n-3)/2.
So 14(14-3)/2 = 77 Diagonals
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A tetra-decagon is a 14 sided polygon having 77 diagonals
An heptagon has 7 sides and 14 diagonals
The name of a 14 sided polygon is tetradecagon.
AnswerA tetrakaidecagon is a 14-sided polygon.
12=)Improved Answer:-It has 14 because the formula of 0.5*(49-27) = 14 diagonals