Question

How many diagonals does a regular hexagon have?

• A. $8$
• B. $9$
• C. $10$
• D. $11$

Answer 1

The correct option is B $9$

The number of diagonals of an $n$ sided polygon is given by $D_n=\frac{n(n-3)}{2}$

A convex regular hexagon has $6$ sides.

So, $n=6$

$\therefore D_6=\frac{6(6-3)}{2}=9$