Question

The number of diagonals in a hexagon is __________.

Answer 1

The number of diagonals in a polygon of n sides is $\frac{n(n–3)}{2}$

Where$n=6$

Then,

$\Rightarrow 6\times \frac{(6–3)}{2}$

$$\begin{gathered} =6\times \frac{3}{2} \\ =\frac{18}{2} \\ =9 \end{gathered}$$