1. Agenda: Check Homework 4.2 Notes Skills Check
4.2: Angles of Triangles
Agenda:
Check Homework
4.2 Notes
Skills Check

2. Check Homework

3. Triangle Angle Sum Theorem:
Question, Topics and Vocabulary
Problems, Definitions and Work
Triangle Angle Sum Theorem:
Auxiliary Line:

4. Example 1
a) Is the following triangle isosceles, scalene, or equilateral? 3x
4x – 10
2x + 30
(x – 10)°
(4x - 10)°
(5x)°

5. Example 2:
The diagram shows the path of the softball in a drill developed by four players. Find the measure of each numbered angle.

6. Remote Interior Angles
Exterior Angle
Remote Interior Angles
Exterior Angle Theorem

7. Example 3:
Find the measure of angle FLW in the fenced flower garden shown.

8. Triangle Angle- Sum Corollaries
Corollary
Triangle Angle- Sum Corollaries
4.1
4.2

9. Example 3: Find the measure of each Numbered angle. a. ∠1 = b. ∠2 =
c. ∠3 =
d. ∠4 =

10. Example 4:
Find m3 if m5 = 130 and m4 = 70. Find m1 if m5 = 142 and m4 = 65. Find m2 if m3 = 125 and m4 = 23.

11. Example 5
Find the value of x.