SOLUTION: find the number of diagonals that can be drawn by joining the vertices of a nonagon

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Question 388798: find the number of diagonals that can be drawn by joining the vertices of a nonagon
Answer by robertb(5830) About Me  (Show Source):
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The formula is d+=+%28n%28n-3%29%29%2F2. Then the number of diagonals that can drawn by joining the vertices of a nonagon (9-gon) is 9*6/2 = 54/2 = 27.