SOLUTION: Determine the number of diagonals in a decagon

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Question 1158259: Determine the number of diagonals in a decagon
Answer by ikleyn(52781) About Me  (Show Source):
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For any convex polygon with "n" vertices / (sides), the number of its diagonals is %28n%2A%28n-3%29%29%2F2.


For decagon (n= 10) the number of diagonals is  %2810%2A%2810-3%29%29%2F2 = %2810%2A7%29%2F2 = 5*7 = 35.    ANSWER

Solved.