1. Angles!!! Geometry Pre-AP

2. Draw an angle…

3. Definition  An angle is formed by two noncollinear rays that have a common endpoint.  The rays are the sides of the angle, and the common endpoint is the vertex.

4. Naming/Labeling Angles  A number  The vertex (if there is only one possible angle)  3 letters, with the vertex being the middle letter

5. Measuring Angles ~ Protractors measure angles! ~ Angles are measured in degrees!

6. How to use a protractor:

8. Types of Angles ~ Right Angle ~ Acute Angle ~ Obtuse Angle ~ Straight Angle ~ Reflex Angle

9. Types of Angles ~ Right Anglex = 90 o ~ Acute Angle0<x<90 o ~ Obtuse Angle90 o <x<180 o ~ Straight Anglex=180 o ~ Reflex Angle180 o <x<360 o

10. Angle Bisector! A line, line segment, or ray that passes through the vertex of the angle and cuts it into two equal smaller angles

11. Pg. 41 (#1 – 10)

12. Discuss the following words with a partner. What do they mean, or what do you think they mean? Have you ever heard them before? ~ Complement~ Supplement ~ Adjacent~ Linear ~ Vertical

13. From Google… ~ Complement --- (noun) a number or quantity of something required to make a group complete --- (verb) add to (something) in a way that enhances or improves it; make perfect

14. In Geometry… ~ Complementary Angles

15. From Google… ~ Supplement --- (noun) something that completes or enhances something else when added to it. --- (verb) add an extra element or amount to

16. In Geometry… ~ Supplementary Angles

17. From Google… ~ Adjacent --- (adj) next to or adjoining something else

18. In Geometry… ~ Adjacent Angles

19. From Google… ~ Linear --- (adj) arranged in or extending along a straight line

20. In Geometry… ~ Linear Pair

21. From Google… ~ Vertical --- (adj) in a direction, or having an alignment, such that the top is directly above the bottom

22. In Geometry… ~ Vertical Angles