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

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) (Show Source): You can put this solution on YOUR website!
.

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.

.

The correct formula is N = .

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