1. 1.5; 14-38 Even 14. GH+HJ=GJ 16. QR+RS=QS 18. False 20. True 22. 16
24. 10
26. Coral Grouper: 9 1/8 in. Trout: 7 ½ in. Difference: 1 5/8 in. Total: 16 5/8 in.
28. JK, LM, and QR
30. No
32. 5y+20
34. D
36. 6

2. 1.6 Angles and Their Measures
Goal:
Measure and classify angles and add angle measures.

3. Key Words Angle Sides Vertex Degree
Consists of two rays that have the same endpoint
Sides
Rays are the sides of the angle
Vertex
Endpoint is the vertex of the angle
Degree
Unit used to measure an angle

4. Name Angles
Name the angles in the figures.

5. Measure Angles
Use a protractor to approximate the measure of

6. Congruent Angles
Two angles are congruent angles if they have the same measure. A B D E C F

7. Classifying Angles By Their Angles
Acute angle
Measure is between 0° and 90°
Obtuse angle
Measure is between 90° and 180°
Right angle
Measure is 90°
Straight angle
Measure is 180 ° A A A A

8. Postulate 6 Angle Addition Postulate
Words:
If P is in the interior of angle RST, then the measure of angle RST is the sum of the measures of angle RSP and angle PST.
Symbols:
If P is in the interior of angle RST, then

9. Add and Subtract Angle Measures
Find the measure of 4. 5. 6. A A D C 40 D 60 D
135 60 90 20 A B B B C C

10. Homework
1.6 pg. 38
15-29 All