Question

quantas diagonais o heptagono possui no total

Answer 1

D= 7 ( 7 - 3 )/2 = 14

14 diagonais. 

Answer 2

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

$d = \dfrac{7 \cdot(7 - 3)}{2}$

$d = \dfrac{7 \cdot4}{2}$

$d = \dfrac{28}{2}$

$d = 14$