Question

Determinar o valor de X no triângulo acima ?​

Answer 1

$\large\boxed{\begin{array}{l}\underline{\sf Observe\,a\,figura\,que\,eu\,anexei.}\\\sf pelo\,teorema\,do\,\hat angulo\,externo\\\sf \theta+30^\circ=70^\circ\\\sf \theta=70^\circ-30^\circ\\\sf\theta=40^\circ\\\sf no\,tri\hat angulo\,ABM~temos:\\\sf x+70^\circ+90^\circ=180^\circ\\\sf x=180^\circ-160^\circ\\\sf x=20^\circ\end{array}}$