Question

Usando a lei de seno e cosseno resolva

Answer 1

a) $x^2=64+36-2.48.\frac{1}{2}\\ x^2=52\\ x=2\sqrt13$






b)$\frac{12}{\frac{\sqrt3}{3}}=\frac{l}{\frac{\sqrt2}{2}}\\\\ l=\frac{12\sqrt2}{2}.\frac{3}{\sqrt3}\\\\ l=\frac{36\sqrt2}{2\sqrt3}.\frac{\sqrt3}{\sqrt3}\\\\ l=\frac{36\sqrt6}{6}\\\\ l=6\sqrt6$