QUESTION IMAGE
Question
dado: \overline{antes de cristo} \parallel \overline{una d} y \overline{antes de cristo} \cong \overline{una d}.
probar: \angle bac \cong \angle dca.
nota: las propiedades cuadriláteras no están permitidas en esta prueba.
paso 1:
declaración: \overline{antes de cristo} \parallel \overline{una d}, \overline{antes de cristo} \cong \overline{una d}
razón: dado
(there is a diagram at the bottom with quadrilateral abcd, where ab and cd have arrows, ac is a diagonal, and bc and ad have tick marks.)
Paso 1: Triángulos congruentes
Paso 2: Ángulos congruentes
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$\angle BAC\cong\angle DCA$