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In the diagram l//m.You also know that 3=~4 because vertical angles are congruent.Which of the following statement can be used to help show that ABC is similar to EDC

In the diagram lmYou also know that 34 because vertical angles are congruentWhich of the following statement can be used to help show that ABC is similar to EDC class=

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The lower left corner is the answer. 
Angle 1 is congruent to angle 5 because they are alternate interior angles (assuming AB || DE)

They are on the inside of the parallel train tracks. By "train tracks" I mean the horizontal lines AB and DE. So they are considered interior angles. They are on alternate sides of the transversal AE. Angle 1 is on the right side while angle 5 is on the left side. These two facts are why they are considered alternate interior angles. 

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