Jawabanmu

2014-08-25T23:29:56+07:00
R= \sqrt{a^2+b^2+2ab*cos \alpha }  \\ 5= \sqrt{3^2+4^2+2(3)(4)*cos \alpha } \\ 25=9+16+24*cos \alpha  \\ 
24*cos \alpha =0 \\ cos \alpha =0 \\  \alpha =90^o

Semoga Membantu Lagi dik :D
2014-08-25T23:32:44+07:00

 nah jadi di amatin lagiii.. SMA yaaa?