Question

Qual é a medida do ângulo a na figura a seguir?​

Answer 1

$\large \boxed{ \begin{array}{l} \alpha + 50 {}^{ \circ} + 50 {}^{ \circ} = 180 {}^{ \circ} \\ \\ \alpha + 100 {}^{ \circ} = 180 {}^{ \circ} \\ \\ \alpha = 180 {}^{ \circ} -100 {}^{ \circ} \\ \\ \boxed{ \boxed{ \alpha = 80 {}^{ \circ} }}\end{array}}$