In a polygon with n sides, we have n(n-3)/2 diagonals. In a convex polygon with n sides, you can draw n-3 diagonals from each vertex, but you are counting each one twice you so you need to divide by do. That is why we have n(n-3) divided by 2
38 diagonals
18
9
20 sides 1/2*(202-60) = 170 diagonals
A 7 sided polygon has 14 diagonals
how many diagonals are there iin a polygon of 11 sides
That polygon is called a "triangle". It has no diagonals.
There are 77 diagonals
In a polygon with n sides, we have n(n-3)/2 diagonals. In a convex polygon with n sides, you can draw n-3 diagonals from each vertex, but you are counting each one twice you so you need to divide by do. That is why we have n(n-3) divided by 2
38 diagonals
It will have ten sides
A polygon with 14 diagonals will have 7 sides
18
9
A pentagon.
13