In the figure shown, AC || ED and point B lies on line segment AC. Which of the following would be a step in proving that the sum of the interior angles in ABDE is 180° ? O 43 because vertical angles are congruent. O mLE+ mL2 +mLD= 180° by substitution. %3D O LDELE because base angles of isosceles triangles are congruent. O3LE because alternate interior angles are congruent when two parallel lines are cut by a transversal. ,白白9圓)

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