Question

qual o numero total de diagonais de:
triangulo
quadrilatero
pentagono
dodecagono

me ajudem.

Answer 1

Triangulo =0
Quadrilátero=2
Pentágono =5
Dodecágono=54

Answer 2

d= n(n-3)/2
A) d=3(3-3)/2
d=3.0/2=0

B) d=4(4-3)/2
d= 4.1/2= 4/2 =2

C) d= 5.(5-3)/2
d= 5(2)/2
d= 10/2=5

D) d= 12(12-3)/2
d= 12.9/2
d= 108/2= 54