Question

na figura abaixo o valor de x é​

Answer 1

$\large\boxed{\begin{array}{l} \rm \:Em \: qualquer \: tri \hat{a}ngulo, \: a \: soma \\ \rm \: de \: seus \: \hat{a}ngulos \: internos \: mede \\ \rm \: 180 {}^{ \circ} . \\ \\ \rm \: 2x + 8x + 4 {}^{ \circ} + x = 180 {}^{ \circ} \\ \\ \rm \: 11x + 4 {}^{ \circ} = 180 {}^{ \circ} \\ \\ \rm \: 11x = 180 {}^{ \circ} - 4 {}^{ \circ} \\ \\ \rm \: 11x = 176 {}^{ \circ} \\ \\ \rm \: x = \dfrac{176 {}^{ \circ} }{11} \\ \\ \red{ \boxed{ \boxed{ \rm{\: \therefore \: x = 16 {}^{ \circ} \: }}}}\end{array}}$