1. Geometry: Angle Measures

2. Do Now: What is the distance between R and Q? What is the distance between S and R?

3. Homework  Questions?  Struggles?  Ask Ask Ask!

4. Definitions:  Angle: An angle is formed by two non- collinear rays that have a common endpoint.  Sides: The rays are the sides of the angle  Vertex: The endpoint is called the vertex of the angle.  Ex:

5. Example One:

6. Example Two: Which angles have R as a vertex? What are the sides of <1? What is another name for <SRP?

7. Angles- Four Types  Obtuse Angles: Are greater than 90 degrees but less than 180 degrees.  Ex:

8. Angles- Four Types  Acute Angles: Are less than 90 degrees  Ex:

9. Angles- Four Types  Right Angles: 90 degree angles  Denoted by a little square.  Ex:

10. Angles- Four Types  Straight Angles: 180 degree angle  i.e. a straight line.  EX:

11. Protractors  Steps to measuring an angle:  Line up the vertex with the center point of the protractor.  Line up the zero line on the protractor with one side of the angle.  Extend the other side of the angle using a ruler or straight edge if needed.  Wherever the other side of the angle hits the protractor is the measure of your angle!

12. Using Protractors

13. Protractor Practice

14.  Try the other two on your own!

15. Congruent Angles  Congruent Lengths are…..  So…. Congruent angles are……?  Notation:

16. Definition  Segment Addition Postulate says what….?  So…. Angle addition postulate says:  Ex:

17. Example Three:

18. Example Four

19. Practice Problems  Try some angle things on your own!

20. Exit Ticket