Respostas

2014-07-10T21:27:09-03:00
D=[8(8-3)]/2 
d=[8.5]/2 
d=40/2 
20
2014-07-10T21:42:54-03:00
D=n. (n-3)/2
d=8.(8-3)/2
8.5/2
40/2
=20