Răspuns :
[tex]a = \frac{ab \times bc \times \sin( < b) }{2} [/tex]
A=8×4×sin 45°/2=
[tex] \frac{8 \times 4 \times \frac{ \sqrt{2} }{2} }{2} = \frac{16 \sqrt{2} }{2} = 8 \sqrt{2} [/tex]
[tex]a = \frac{ab \times bc \times \sin( < b) }{2} [/tex]
A=8×4×sin 45°/2=
[tex] \frac{8 \times 4 \times \frac{ \sqrt{2} }{2} }{2} = \frac{16 \sqrt{2} }{2} = 8 \sqrt{2} [/tex]