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🧮 8th Grade · Math8.G.A.5Unit 1: Rigid transformations & congruence

Angles and parallel lines

Google Classroom

🎯 Objective: Students find angles formed by parallel lines and a transversal and angle sums in triangles.

Lesson outline

  1. Tear triangle corners.
  2. Parallel line angles.
  3. Practice.
  4. Exit: one unknown angle.

Lesson 5 of 5 in this unit. In the Lesson Planner this lesson takes 1–3 class periods depending on your timetable: day 1 introduce & model, then practice, small-group reteach and a quick check.

📐 Standard

8.G.A.5

Common Core State Standards for Mathematics, Grade 8 — typical US scope & sequence

🏁 Unit goals

  • Describe translations, reflections and rotations
  • Use transformations to show congruence

✅ Check for understanding

End with the exit ticket in the outline. Sort answers into got it / almost / not yet and start the next lesson with a 5-minute reteach for the “not yets”.

Practice & resources on Thinkabara

🎯 Practice: Pythagorean theorem📚 All 8th Grade skills🎮 Learning games⚡ Capy Live class quiz

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More lessons in “Rigid transformations & congruence”

  1. Translations
  2. Reflections
  3. Rotations
  4. Congruence
  5. Angles and parallel lines

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