How many diagonals does a regular Hexagon has ?

2 9 3 5

9

The number of sides in hexagon are 6.  Formulae for calculating number of diagonals is: = \(\frac{n(n-3) }{2}\)  = \(\frac{6(6-3) }{2}\)  = \(\frac{6(3) }{2}\)  = \(\frac{18 }{2}\)  = 9 Thus, a regular hexagon has 9 diagonals