The formula $D = \frac { n ( n - 3 ) } { 2 }$ yields the number of diagonals, D , in a polygon of n sides. Find the number of sides of a polygon that has 90 diagonals. __________ sides

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The Answer of The formula $D = \frac { n ( n - 3 ) } { 2 }$ yields the number of diagonals, D , in a polygon of n sides. Find the number of sides of a polygon that has 90 diagonals. __________ sides

The Formula D=n(n−3)2D = \frac { n ( n - 3 ) } { 2 }D=2n(n−3)​

The Formula $D = \frac { n ( n - 3 ) } { 2 }$