Eight is the lucky number of angles when a line crosses two parallel lines. Scholars watch a concise video in the Socratica Geometry series to learn about angles made by parallel lines and a transversal. Using corresponding and vertical angles helps show that four of the eight angles are congruent.

Concepts

parallel lines, parallel lines with a transversal, transversal, corresponding angles

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Additional Tags

math

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Instructional Ideas

• Have the class create graphic organizers summarizing angle relationships

Classroom Considerations

• Pupils must have knowledge of vertical angles
• Note that the video does not mention alternate interior or alternate exterior angles

• This video is hosted on YouTube

Pros

• Animations are simplistic but helpful

Cons

• Very slow-paced video
  

Common Core

8.G.A.5