If the polygon has n sides, it has n*(n - 3)/2 diagonals
So, n(n - 3)/2 = 40
or n(n - 3)= 80
for which there is no solution.
The question has no answer in terms of plane geometry.
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how many diagonals are there iin a polygon of 11 sides
A triangle has 3 sides and no diagonals
20 sides and 170 diagonals
Use the equation n(n-3) / 2 Where n = number of sides So, 40(40 - 3) / 2 = 740
a triangle has three diagonals as well as three sides