Jawabanmu

2014-04-15T09:26:45+07:00
Jb: x^2 = y^2+z^2-2*y*z*cosX x^2 = 4^2+4^2-2*4*4*cos 90° x^2 = 16+16-32*0 x^2 = 32-0 x = 4 akar 2 x/sin X = y/sin Y 4 akar 2/ sin 90° = 4/ sin Y 4 akar 2 = 4/ sin Y sin Y = 1/2 akar 2 Y = 45°