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Back to Use informal arguments to establish facts about angles and similarity of triangles — Problem 1 · Task Set 25

Use Informal Arguments to Establish Facts About Angles and Similarity of Triangles

Work through each section in order. Show your work where indicated, and state which angle relationship you used to find each answer.

Grade 8·23 problems·~40 min·Common Core Math - Grade 8·container·8-g-a-5
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Two parallel lines cut by a transversal, with the four angles at the top intersection numbered 1 to 4 and the four at the bottom intersection numbered 5 to 8.
1.

In the diagram, two parallel lines are cut by a transversal. Angle 1 and angle 5 are in the same position at each intersection. What is this pair of angles called?