1. Types of Triangles

2. What is a TRIANGLE ?
A closed figure formed by joining three line segments is called a TRIANGLE .

3. A triangle has three sides1 2 3

4. A triangle has three angles1 2 3

5. Interior Angles of TrianglesB C
The sum of the measure of the angles of a triangle is 1800.
Ð A + Ð B + ÐC =1800

6. Classifying Triangles by Sides
Isosceles Triangle
at least two equal sides
Scalene Triangle
no equal sides
Equilateral Triangle
three equal sides E S
T R I C K I

7. Classifying Triangles by Angles
Acute Triangle
three acute angles
Right Triangle
one right angle
Obtuse Triangle
one obtuse angle

8. Name the Type of Triangle

9. Name the Type of Triangle
Equilateral Triangle

10. Name the Type of Triangleb.

11. Name the Type of Triangleb.
Right Triangle

12. What is the measure of the missing angle?

13. What is the measure of the missing angle?

14. What is the measure of the missing angle?

15. What is the measure of the missing angle?

16. Name the Type of Triangle

17. Name the Type of Triangle
Isosceles Triangle

18. Name the Type of Triangle

19. Name the Type of Triangle
Scalene Triangle