The equationn $D = \frac { 1 } { 2 } n ( n - 3 )$ gives the n gives the umber of diagonals D for a polygon with n sides. Use this equation to solve the problem.
-Find the number of diagonals for a polygon that has 14 sides.

Question

The equationn   $D = \frac { 1 } { 2 } n ( n - 3 )$ gives the n gives the umber of diagonals D for a polygon with n sides. Use this equation to solve the problem.
-Find the number of diagonals for a polygon that has 14 sides.

Quizplus · Accepted Answer

Substituting $n = 14$ into the equation $D = \frac{1}{2} n (n - 3)$, we get $D = \frac{1}{2} \times 14 \times (14 - 3) = 7 \times 11 = 77$ diagonals.

The Equationn D=12n(n−3)D = \frac { 1 } { 2 } n ( n - 3 )D=21​n(n−3)

The Equationn $D = \frac { 1 } { 2 } n ( n - 3 )$