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Understanding Triangles: Classification by Sides and Angles

Triangles can be classified based on their sides and angles. There are three types of triangles by sides: equilateral (three equal sides), isosceles (two equal sides), and scalene (no equal sides). By angles, triangles can be acute (all angles less than 90 degrees), right (one angle is exactly 90 degrees), or obtuse (one angle greater than 90 degrees). Learn how to classify triangles correctly through this lesson, identifying their properties and characteristics based on both sides and angles.

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Understanding Triangles: Classification by Sides and Angles

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  1. Triangles TOPIC 9 LESSON 9-5

  2. Triangles can be classified by their sides. 3 equal sides equilateral triangle

  3. Triangles can be classified by their sides. 2 equal sides isosceles triangle

  4. Triangles can be classified by their sides. 0 equal sides scalene triangle

  5. Triangles can also be classified by their angles. 1 right angle right triangle One angle measures 90 degrees. The other 2 are acute or less than 90 degrees.

  6. Triangles can also be classified by their angles. 3 acute angles acute triangle All angles measure less than 90 degrees.

  7. Triangles can also be classified by their angles. 1 obtuse angle obtuse triangle One angle measures greater than 90 degrees.

  8. Classify this triangle by its sides and angles.

  9. Did you say. . . equilateral, acute? 3 equal sides, 3 acute angles

  10. Classify this triangle by its sides and angles.

  11. Did you say . . . isosceles, right? 2 equal sides, one right angle

  12. Classify this triangle by its sides and angles.

  13. Did you say . . . scalene, obtuse? 0 equal sides, 1 obtuse angle

  14. Can you classify this triangle by its sides and angles?

  15. Did you say . . . scalene, right? 0 equal sides,1 right angle

  16. Classify this triangle by its sides and angles.

  17. Did you say. . . isosceles, acute 2 equal sides, 3 acute angles

  18. Now you know how to identify triangles.

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