Classifying Triangles.pptx Classifying Triangles

Classifying Triangles

1. Exploring & Classifying Triangles

2. Triangle Sort Sort the triangles into three groups so that no triangle belongs into more than one group. Once you have sorted them, get one sticky note per each group. Then label your groups with sticky notes to identify the attribute(s) they have in common.

3. Let's Try It Again! Sort your triangles into three new groups so that no triangle belongs into more than one group. Once you have sorted them, get one sticky note per each group. Then label your groups with sticky notes to identify the attribute(s) they have in common.

4. Now let’s look at some of the vocabulary we can use to describe and sort triangles…

5. Triangles can be classified by: Scalene Equilateral Isosceles Right Acute Obtuse Angles: Sides: No sides are the same length. At least 2 sides are the same length. All sides are the same length. Has one angle that is a right (90 degree) angle. All 3 angles are acute (less than 90 degrees). Has 1 angle that is an obtuse angle (greater than 90 degrees).

6. Creating Triangles Use the AngLegs and your knowledge of the types of triangles to try to create a triangle that fits both labels on the chart. Sketch your triangle on the chart. Equilateral Isosceles Scalene Right Acute Obtuse

7. Which two triangles were impossible to make? Why?

8. Types of Triangles: Sides

9. Types of Triangles: Angles

10. Classifying Triangles By Their Sides

11. Types of Triangles Equilateral triangle: three congruent (equal) sides and three equal angles These marks indicate equality.

12. Types of Triangles Isosceles triangle: two congruent (equal) sides

13. Types of Triangles Scalene triangle: A triangle that has no congruent (equal) sides

14. Interior Angles Interior angles of a triangle always equal 180 degrees.

15. Example Find the missing angle 96 o 39 o x o

16. Classifying Triangles By Their Angles

17. Types of Triangles Right triangle: Has only one right angle (90 degrees) This box indicates a right angle or a 90-degree angle.

18. Acute Triangles Acute triangles have three acute angles

19. Obtuse Triangles Obtuse triangles have one obtuse angle