SOLUTION: A quadrilateral has 4 sides and 2 diagonals. A pentagon has 5 sides and 5 diagonals. You can use 1/2n^2 to find the number of diagonals in a polygon with n sides Write this expre

Algebra ->  Test -> SOLUTION: A quadrilateral has 4 sides and 2 diagonals. A pentagon has 5 sides and 5 diagonals. You can use 1/2n^2 to find the number of diagonals in a polygon with n sides Write this expre      Log On


   

Question 1081647: A quadrilateral has 4 sides and 2 diagonals. A pentagon has 5 sides and 5 diagonals. You can use 1/2n^2 to find the number of diagonals in a polygon with n sides
Write this expression in factored form.
Find the the number of diagonals in a decagon.
Answer by ikleyn(52921) About Me  (Show Source):
You can put this solution on YOUR website!
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The condition is WRONG.



You CAN NOT use 1/2n^2 to find the number of diagonals in a polygon with n sides, because this formula is WRONG.

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The correct formula is N = %28n%2A%28n-3%29%29%2F2.