##### LESSON SET
Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.

## Find the measurements of corresponding angles

In this lesson, you will learn how to find the measurements of angles created when parallel lines are cut by a transversal by using corresponding angles.
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• #### Lesson slides for 'Find the measurements of corresponding angles'

In this lesson, you will learn how to find the measurements of angles created when parallel lines are cut by a transversal by using corresponding angles. (Slides used in the main video lesson in PowerPoint format.)

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• #### Guided practice for 'Find the measurements of corresponding angles'

In this lesson, you will learn how to find the measurements of angles created when parallel lines are cut by a transversal by using corresponding angles. (Brief video that guides students through a practice problem.)

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• #### Lesson commentary for 'Find the measurements of corresponding angles'

In this lesson, you will learn how to find the measurements of angles created when parallel lines are cut by a transversal by using corresponding angles. (Video lesson with the author's voice over, explaining key concepts, misconceptions, and points of ...

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