1. Chapter 1.4 Angle Measure

2. Vocabulary Ray – part of a line that has one endpoint and extends indefinitely in one direction. Opposite Rays – two rays that share a common endpoint and are collinear Angle – formed by two noncollinear rays (sides) that share a common endpoint (vertex). There is an interior of each angle and an exterior of each angle.

3. Example 1 Angles and Their Parts A. Name all angles that have B as a vertex. Answer:

4. Example 1 Angles and Their Parts Answer: B. Name the sides of  5.

5. Example 1 Angles and Their Parts C.

6. Example 1a A. B. C. D.

7. Example 1b A. B. C. D.none of these

8. A. B. C. D. Example 1c Which of the following is another name for  3?

9. Concept

10. Measure and Classify Angles A. Measure  TYV and classify it as right, acute, or obtuse. Answer: m  TYV = 90, so  TYV is a right angle.

11. Measure and Classify Angles Answer: 180 > m  WYT > 90, so  WYT is an obtuse angle.

12. Measure and Classify Angles

13. Protractor Time! Measure an angle Create an angle

14. Measure and Classify Angles INTERIOR DESIGN Wall stickers of standard shapes are often used to provide a stimulating environment for a young child’s room. A five-pointed star sticker is shown with vertices labeled. Find m  GBH and m  HCI if  GBH   HCI, m  GBH = 2x + 5, and m  HCI = 3x – 10.

15. A.m  BHC = 105, m  DJE = 105 B.m  BHC = 35, m  DJE = 35 C.m  BHC = 35, m  DJE = 105 D.m  BHC = 105, m  DJE = 35 Find m  BHC and m  DJE if  BHC   DJE, m  BHC = 4x + 5, and m  DJE = 3x + 30.