1. Triangles

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

3. Types of Triangles
Isosceles triangle: A triangle with at least two congruent (equal) sides

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

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

6. Types of Triangles
Name each type of triangle 2 4 1 3

7. Types of Triangles Name each type of triangle Right 4 2 Scalene 1 3
Equilateral
Isosceles

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

9. Example
Find the missing angle xo
96o
39o