The number of diagonals of a polygon with n sides is given by S (n)=n(n-3)/2 Part A
Which equation shown indicates that a 4-sided polygon has 2 diagonals?
S (2) = 4
S (4) = 2
S (2n) = 4
S (4n) = 2
Part B
What is the value of S (100), and what does it represent?
S(100) = ?
and it means that a polygon with ?sides has diagonals?

What are “like terms”? why can we only add like terms?

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