SOLUTION: What is the sum the interior angles of a 13-gon? What is the sum the interior angles of a 20-gon? What is the sum the interior angles of a 18-gon?

Question 107979: What is the sum the interior angles of a 13-gon?
What is the sum the interior angles of a 20-gon?
What is the sum the interior angles of a 18-gon?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

The sum of interior angle ( Sum-of-interior-angles-n-gon) of n-gon is:

If we have a ,
Then

If we have ,

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