A polygon with n sides had n*(n-3)/2 diagonals.
So a 20 sided polygon would have 20*17/3 = 170
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That polygon is called a "triangle". It has no diagonals.
how many diagonals are there iin a polygon of 11 sides
An 11 sided polygon has 44 diagonals.
A four-sided polygon has two diagonals.
A polygon with 14 diagonals will have 7 sides