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Triangle Classification & Properties: Learn, Review, and Practice Geometry

Learn how to classify triangles by sides (Equilateral, Isosceles, Scalene) and by angles (Obtuse, Right, Acute). Review points, lines, and segments while mastering writing angles using letters and symbols. Explore the meaning of 'congruent' and the characteristics of different triangle types. Get your notebook out for hands-on practice!

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Triangle Classification & Properties: Learn, Review, and Practice Geometry

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  1. Classifying Triangles Have out your notebook 

  2. Review • Ray • Segment • Line • Point

  3. Review • How many points do you need to draw a line?

  4. Review • Do you know how to write lines, segments, rays, and points using letters and symbols above them?

  5. Review • Why did we talk about Buzz Lightyear?

  6. What does “congruent” mean?

  7. Scalene Triangle • Scalene triangles have no congruent sides.

  8. Isosceles Triangle • Isosceles triangles have two congruent sides (also angles).

  9. Equilateral Triangle • Equilateral triangles have three congruent sides (also angles).

  10. Acute Triangle • An acute triangle has three acute angles.

  11. Right Triangle • A right triangle has oneright angle.

  12. Obtuse Triangle • An obtuse triangle has one obtuse angle.

  13. Classifying Triangles • By Sides (Equilateral, Isosceles, and Scalene) • By Angles (Obtuse, Right, and Acute)

  14. Writing Angles JKL J K L

  15. Song! • Ready to sing!?

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