Question

Mark (✓) against the correct answer:
How many diagonals are there in a hexagon?
(a) 6
(b) 8
(c) 9
(d) 10

Answer 1

(c) 9
Hexagon has six sides.
$$\begin{gathered} \mathrm{Number}\mathrm{of}\mathrm{diagonals}=\frac{n(n-3)}{2}(\mathrm{where}n\mathrm{is}\mathrm{the}\mathrm{number}\mathrm{of}\mathrm{side}s) \\ =\frac{6(6-3)}{2} \\ =9 \end{gathered}$$