Líneas paralelas y transversales

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Encuentra los valores faltantes y explica el por qué de cada uno:
1. $\angle 6$ $\cong$ ?
2. $\angle 2$ $\cong$ ?
3. Si el $\angle 8$ = 60°, entonces $\angle 1$ = ?
4. $\angle 3$ y $\angle ?$ son ángulos suplementarios.

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