Question

11. Quantas diagonais tem um hexágono convexo?

Answer 1

D= (n-3)
6-3=3
6.3:2
18:2
9

Answer 2

$d = \dfrac{n \cdot(n - 3)}{2}$

$d = \dfrac{6 \cdot(6 - 3)}{2}$

$d = \dfrac{6 \cdot3}{2}$

$d = \dfrac{18}{2}$

$d = 9$