Triangles

1
Triangles
2
Types of Triangles

• Equilateral triangle three congruent (equal)
  sides and three equal angles

These marks indicate equality.
3
Types of Triangles

• Isosceles triangle two congruent (equal) sides

4
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
Interior Angles

• Interior angles of a triangle always equal 180
  degrees.

7
Example

• Find the missing angle

xo
96o
39o