Pruebas con líneas paralelas

Now Playing:Es parallel line proofs – Example 1a

¿Cual es el valor de $x$ si $\overline {AB}$ $\parallel$ $\overline {CD}$ ?
Dado que $\, m \parallel$ $n$ , y $\angle 1$ $\cong$ $\angle 2$ , prueba que $\, s \parallel$ $t$

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