1. Angles

2. Objectives Name and classify angles.
2) Define complementary and supplementary angles.
3) Apply definitions of complementary and supplementary angles.

3. Possible Names for this angle:
An angle has two sides than meet a the vertex. In the angle below the sides are 𝑅𝑆 and 𝑅𝑇. These two sides intersect a the vertex of the angle which is point R.
Possible Names for this angle: 1 R
SRT
TRS

5. We do: Example 1B
How many angles are there in this diagram? Give a possible name for each of them.

6. I Do: Example 2A
The measure of an angle is usually given in degrees (later in the year we will learn that you can also measure angles in radians) . A protractor is the tool used to measure angles in degrees.

7. We do: Example 2B

8. You Do: Example 2C

10. We do: Example 2D
Find the measure of each angle. Then classify each as acute, right, or obtuse.
A. WXV
B. YXZ
C. ZXW
D. YXW

11. Congruent angles are angles that have the same measure
Congruent angles are angles that have the same measure. Arc marks are used to show that the two angles are congruent.

12. In simpler words: we can add angles.

13. Complementary Angles (Definition)
To be complementary the sum of the two angles must equal 90 degrees.

14. Supplementary Angles (Definition)
Example 1
Example 2
To be supplementary the sum of the two angles must equal 180 degrees.
The angles in example 1 are also called a linear pair.

15. Link to Gizmos

16. Find the value of each angle
We Do: Example 3B
Find the value of each angle

17. You Do: Example 3C
Find the value of x.

18. We Do: Example 4B

19. You Do: Example 4C
Find the value of x.

20. Exit Slip
Given
mWYZ = (2x – 5)°
mXYW = (3x + 10)°
Find the value of x.