QUESTION IMAGE
Question
- in the figure below, a||b. what is the value of x?
- which lines are parallel? how do you know?
Step1: Calcular la suma de ángulos
La suma de los ángulos en un punto es $360^{\circ}$.
Step2: Calcular el ángulo no nombrado
$360-(120 + 100)=140^{\circ}$
Step3: Calcular $x$
Como $a\parallel b$, $x = 180 - 140=40^{\circ}$
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$40^{\circ}$