Question

How many diagonals are there in a hexagon?

• A. 6
• B. 4
• C. 11
• D. 9

Answer 1

The correct option is D 9

Let there be 'n' sides of the polygen Number of diagonals
$=[\frac{n(n-1)}{2}-n]$
$=[\frac{6(6-1)}{2}-6]$
$=\frac{6\times 5}{2}-6=9$