Respostas

2014-07-24T22:44:05-03:00
Olá, Luziaariany!

D = n(n - 3) / 2
D = 12(12 - 3) / 2
D = 12(9) / 2
D = 6 . 9
D = 54 diagonais.
2 3 2
2014-07-24T22:45:24-03:00
d=n(n-3)/2

d= diagonal

n = lados do polígono