Răspuns:
Explicație pas cu pas:
[tex]A _{\triangle ABC}= \frac{AB\times BC \times sinB}{2} \\ = \frac{8 \times 5 \times sin30 }{2} \\ = \frac{\not{8} \times 5 \times \frac{1}{\not{2}} }{2} \\ = \frac{\not{4} \times 5}{\not{2}} \\ = 2 \times 5 \\ = \boxed{{10cm}^{2}}[/tex]
