Question

utilizando a lei dos cossenos,.calcule o valor do segmento x no triangulo a seguir.

Answer 1

Aplicando a lei dos cossenos:

$x^2=3^2+8^2-2\,.\,3\,.\,8\,.\,cos(60^\circ)\\\\\\x^2=9+64-48.cos(60^\circ)\\\\\\x^2=73-48.\frac{1}{2}\\\\\\x^2=73-24\\\\\\x^2=49\\\\\\x=\sqrt{49}\\\\\\x=7$