Question

I need help with this question!

Answer 1

A)
A polygon is a closed shape so there must be at least three sides. Therefore, the least value that n can be would be three.

b)
n        value
3          0
n(n-3)/2
3(3-3)/3
3(0)/3
0/3
0

4         2
n(n-3)/2
4(4-3)/2
4(1)/2
4/2
2

5        5
n(n-3)/2
5(5-3)/2
5(2)/2
10/2
5