Classifying triangles

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Intros
Lessons
  1. Introduction to Classifying triangles:
  2. What are the basic characteristics of triangle shapes/polygons?
  3. How to classify triangles by their side length
  4. How to classify triangles by their angles
  5. Review on the six classifications for triangles
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Examples
Lessons
  1. Classifying triangles by side lengths
    Classify the triangle by its side lengths. Is it scalene, isosceles, or equilateral?

    1. Angles and Polygons: Classifying triangles

    2. Angles and Polygons: Classifying triangles

    3. Angles and Polygons: Classifying triangles

    4. Angles and Polygons: Classifying triangles

    5. Angles and Polygons: Classifying triangles

    6. Angles and Polygons: Classifying triangles
  2. Classifying triangles by angles
    Classify the triangle by its angles. Is it acute, right, or obtuse?

    1. Angles and Polygons: Classifying triangles

    2. Angles and Polygons: Classifying triangles

    3. Angles and Polygons: Classifying triangles

    4. Angles and Polygons: Classifying triangles

    5. Angles and Polygons: Classifying triangles

    6. Angles and Polygons: Classifying triangles
  3. Classifying triangles by more than one type
    Classify the triangle by BOTH its side length and angles. (scalene, isosceles, or equilateral; acute, right or obtuse)

    1. Angles and Polygons: Classifying triangles

    2. Angles and Polygons: Classifying triangles

    3. Angles and Polygons: Classifying triangles
  4. Word Problems: Classifying Triangles
    Use this figure to answer the following questions:
    Angles and Polygons: Classifying triangles
    1. If a triangle's side lengths are: 2cm, 1cm, and 1.73cm how would you classify it and why?
    2. If this triangle is a right triangle, what types of angles does it have?
    3. Is it possible for this triangle to have an obtuse angle? Why or why not?
    4. If this right triangle has one angle that is 30°, give the measures of all three of the angles.
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Practice