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Classify Triangles by Sides and Angles

Learn how to identify the characteristics of triangles based on their sides and angles, including acute, right, obtuse, isosceles, equilateral, and scalene triangles. Practice measuring sides and identifying angles.

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Classify Triangles by Sides and Angles

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  1. Splash Screen

  2. Five-Minute Check (over Lesson 13–2) Main Idea and Vocabulary Key Concept: Classify Triangles by Sides Example 1: Identify Sides Key Concept: Classify Triangles by Angles Example 2: Identify Angles Identify Angles Lesson Menu

  3. I will identify characteristics of triangles. • acute triangle • right triangle • obtuse triangle • isosceles triangle • equilateral triangle • scalene triangle Main Idea/Vocabulary

  4. KC

  5. Identify Sides Measure to find the number of congruent sides. Then state whether any of the sides appear to be perpendicular. Write yes or no. Answer: All of the sides of the triangle have the same length. So, all 3 sides are congruent. No; none of the sides of the triangle appear to be perpendicular. Example 1

  6. A B C D Measure to find the number of congruent sides. Then state whether any of the sides appear to be perpendicular. • 2; yes • 2; no • none; yes • none; no Example 1

  7. KC

  8. Identify Angles Triangles form the dome of Spaceship Earth at Epcot Center in Florida. Identify the kind of angles in the triangles. Draw a triangle like the ones in the photo. Answer: There are two acute angles and one obtuse angle. Example 2

  9. A B C D Identify the kind of angles in the triangles. • 1 right, 2 acute • 1 right, 2 obtuse • 3 right • 2 acute, 1 obtuse Example 2

  10. End of the Lesson End Lesson

  11. Five-Minute Check (over Lesson 13–2) Image Bank Math Tool Chest Identify Angles Resources

  12. A B C D (over Lesson 13–2) Solve. Use the logical reasoning strategy. Andrea, Gaby, Mateo, and Akil raced in the hundred meter dash. Use the following clues to determine the order of the runners at the finish line. 1. Mateo could not catch up with Gaby or Akil.2. Andrea did not come in second or third.3. Gaby pulled ahead of Akil right at the finish line to take first place. • Gaby–first, Akil–second, Mateo–third, Andrea–fourth • Akil–first, Mateo–second, Gaby–third, Andrea–fourth • Andrea–first, Gaby–second, Mateo–third, Akil–fourth • Gaby–first, Akil–second, Andrea–third, Mateo–fourth Five Minute Check 1

  13. End of Custom Shows

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