QUESTION IMAGE
Question
¿cuál es la medida del ∠3?
Step1: Encontrar el valor de \( x \)
Como las líneas son paralelas, \( 40^{\circ}+5x + 36^{\circ}=180^{\circ} \) (ángulos suplementarios).
$$\begin{align*}
5x+76^{\circ}&=180^{\circ}\\
5x&=180^{\circ}-76^{\circ}\\
5x&=104^{\circ}\\
x& = 20.8^{\circ}
\end{align*}$$
Step2: Encontrar \( \angle 1 \)
\( \angle 1=5x + 36^{\circ} \), sustituyendo \( x = 20.8^{\circ} \):
$$\begin{align*}
\angle 1&=5\times20.8^{\circ}+36^{\circ}\\
&=104^{\circ}+36^{\circ}\\
&=140^{\circ}
\end{align*}$$
Step3: Encontrar \( \angle 3 \)
\( \angle 1+\angle 3 = 180^{\circ} \) (ángulos suplementarios), entonces \( \angle 3=180^{\circ}-\angle 1 \)
$$\begin{align*}
\angle 3&=180^{\circ}-140^{\circ}\\
&=40^{\circ}
\end{align*}$$
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