Respostas

2014-05-26T12:20:09-03:00
Lei dos cossenos
considerando √2=1.4
F²=F²+F²+2FF.COS45
   =12²+16²+2.12.16.√2/2
   =144+256+384√2/2
   =400+384√2/2
   =800+384.1,4/2
   =800+537,6/2
   =668,8
 F=√668,8=25,8