Respostas

2014-07-23T19:26:59-03:00
A=n.F/2
A= 3.10/2+4.10/2+10.1/2
A= 30/2 + 40/2 + 10/2
A= 15+20+5
A=40

V-A+F=2
V=2+40-21
V=21