1. 3-4 Triangles

2. Types of Triangles (by angles)
equiangular
acute
right
obtuse

3. Types of Triangles (by sides)
equilateral
isosceles
scalene

4. Triangle Sum Theorem (3-12)
The sum of the measures of the angles in any triangle is 180.

5. Parts to a Triangle
exterior angle
remote interior angles

6. Triangle Exterior Angle Theorem (3-13)
The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles.

7. Example
Find x.
88
40 x
x =
128

8. Today’s Assignment
P. 150 #1-26